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1260 lines
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<p class='location'><a href='index.html'>mime</a></p><script>window.sidebarCurrent = {name: 'Attr', ty: 'enum', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content enum">
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<h1 class='fqn'><span class='in-band'>Enum <a href='index.html'>mime</a>::<wbr><a class='enum' href=''>Attr</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a id='src-309' class='srclink' href='../src/mime/lib.rs.html#139-142' title='goto source code'>[src]</a></span></h1>
|
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<pre class='rust enum'>pub enum Attr {
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||
Charset,
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||
Boundary,
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||
Q,
|
||
Ext(<a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a>),
|
||
}</pre><h2 class='variants'>Variants</h2>
|
||
<span id='variant.Charset' class='variant'><code>Charset</code></span><span id='variant.Boundary' class='variant'><code>Boundary</code></span><span id='variant.Q' class='variant'><code>Q</code></span><span id='variant.Ext' class='variant'><code>Ext(<a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a>)</code></span><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-315' class='srclink' href='../src/mime/lib.rs.html#144-151' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.as_str' class='method'><code>fn <a href='#method.as_str' class='fnname'>as_str</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code></h4>
|
||
</div><h2 id='deref-methods'>Methods from <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html' title='core::ops::Deref'>Deref</a><Target=<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>></h2><div class='impl-items'><h4 id='method.len' class='method'><code>fn <a href='#method.len' class='fnname'>len</a>(&self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns the length of <code>self</code>.</p>
|
||
|
||
<p>This length is in bytes, not <a href="primitive.char.html"><code>char</code></a>s or graphemes. In other words,
|
||
it may not be what a human considers the length of the string.</p>
|
||
|
||
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='string'>"foo"</span>.<span class='ident'>len</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>3</span>, <span class='ident'>len</span>);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>len</span> <span class='op'>=</span> <span class='string'>"ƒoo"</span>.<span class='ident'>len</span>(); <span class='comment'>// fancy f!</span>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>len</span>);</pre>
|
||
</div><h4 id='method.is_empty' class='method'><code>fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns true if this slice has a length of zero bytes.</p>
|
||
|
||
<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>""</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>is_empty</span>());
|
||
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"not empty"</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>s</span>.<span class='ident'>is_empty</span>());</pre>
|
||
</div><h4 id='method.is_char_boundary' class='method'><code>fn <a href='#method.is_char_boundary' class='fnname'>is_char_boundary</a>(&self, index: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div></h4>
|
||
<div class='docblock'><p>Checks that <code>index</code>-th byte lies at the start and/or end of a
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||
UTF-8 code point sequence.</p>
|
||
|
||
<p>The start and end of the string (when <code>index == self.len()</code>) are
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||
considered to be
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||
boundaries.</p>
|
||
|
||
<p>Returns <code>false</code> if <code>index</code> is greater than <code>self.len()</code>.</p>
|
||
|
||
<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>is_char_boundary</span>(<span class='number'>0</span>));
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||
<span class='comment'>// start of `老`</span>
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>is_char_boundary</span>(<span class='number'>6</span>));
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>is_char_boundary</span>(<span class='ident'>s</span>.<span class='ident'>len</span>()));
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||
|
||
<span class='comment'>// second byte of `ö`</span>
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>s</span>.<span class='ident'>is_char_boundary</span>(<span class='number'>2</span>));
|
||
|
||
<span class='comment'>// third byte of `老`</span>
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>s</span>.<span class='ident'>is_char_boundary</span>(<span class='number'>8</span>));</pre>
|
||
</div><h4 id='method.as_bytes' class='method'><code>fn <a href='#method.as_bytes' class='fnname'>as_bytes</a>(&self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&[</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Converts a string slice to a byte slice.</p>
|
||
|
||
<h1 id='examples-3' class='section-header'><a href='#examples-3'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>bytes</span> <span class='op'>=</span> <span class='string'>"bors"</span>.<span class='ident'>as_bytes</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>b"bors"</span>, <span class='ident'>bytes</span>);</pre>
|
||
</div><h4 id='method.as_ptr' class='method'><code>fn <a href='#method.as_ptr' class='fnname'>as_ptr</a>(&self) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.pointer.html'>*const </a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Converts a string slice to a raw pointer.</p>
|
||
|
||
<p>As string slices are a slice of bytes, the raw pointer points to a
|
||
<a href="primitive.u8.html"><code>u8</code></a>. This pointer will be pointing to the first byte of the string
|
||
slice.</p>
|
||
|
||
<h1 id='examples-4' class='section-header'><a href='#examples-4'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Hello"</span>;
|
||
<span class='kw'>let</span> <span class='ident'>ptr</span> <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>as_ptr</span>();</pre>
|
||
</div><h4 id='method.slice_unchecked' class='method'><code>unsafe fn <a href='#method.slice_unchecked' class='fnname'>slice_unchecked</a>(&self, begin: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, end: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Creates a string slice from another string slice, bypassing safety
|
||
checks.</p>
|
||
|
||
<p>This new slice goes from <code>begin</code> to <code>end</code>, including <code>begin</code> but
|
||
excluding <code>end</code>.</p>
|
||
|
||
<p>To get a mutable string slice instead, see the
|
||
<a href="#method.slice_mut_unchecked"><code>slice_mut_unchecked()</code></a> method.</p>
|
||
|
||
<h1 id='safety' class='section-header'><a href='#safety'>Safety</a></h1>
|
||
<p>Callers of this function are responsible that three preconditions are
|
||
satisfied:</p>
|
||
|
||
<ul>
|
||
<li><code>begin</code> must come before <code>end</code>.</li>
|
||
<li><code>begin</code> and <code>end</code> must be byte positions within the string slice.</li>
|
||
<li><code>begin</code> and <code>end</code> must lie on UTF-8 sequence boundaries.</li>
|
||
</ul>
|
||
|
||
<h1 id='examples-5' class='section-header'><a href='#examples-5'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class='kw'>unsafe</span> {
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Löwe 老虎 Léopard"</span>, <span class='ident'>s</span>.<span class='ident'>slice_unchecked</span>(<span class='number'>0</span>, <span class='number'>21</span>));
|
||
}
|
||
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Hello, world!"</span>;
|
||
|
||
<span class='kw'>unsafe</span> {
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"world"</span>, <span class='ident'>s</span>.<span class='ident'>slice_unchecked</span>(<span class='number'>7</span>, <span class='number'>12</span>));
|
||
}</pre>
|
||
</div><h4 id='method.slice_mut_unchecked' class='method'><code>unsafe fn <a href='#method.slice_mut_unchecked' class='fnname'>slice_mut_unchecked</a>(&mut self, begin: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, end: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -> &mut <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div></h4>
|
||
<div class='docblock'><p>Creates a string slice from another string slice, bypassing safety
|
||
checks.</p>
|
||
|
||
<p>This new slice goes from <code>begin</code> to <code>end</code>, including <code>begin</code> but
|
||
excluding <code>end</code>.</p>
|
||
|
||
<p>To get an immutable string slice instead, see the
|
||
<a href="#method.slice_unchecked"><code>slice_unchecked()</code></a> method.</p>
|
||
|
||
<h1 id='safety-1' class='section-header'><a href='#safety-1'>Safety</a></h1>
|
||
<p>Callers of this function are responsible that three preconditions are
|
||
satisfied:</p>
|
||
|
||
<ul>
|
||
<li><code>begin</code> must come before <code>end</code>.</li>
|
||
<li><code>begin</code> and <code>end</code> must be byte positions within the string slice.</li>
|
||
<li><code>begin</code> and <code>end</code> must lie on UTF-8 sequence boundaries.</li>
|
||
</ul>
|
||
</div><h4 id='method.split_at' class='method'><code>fn <a href='#method.split_at' class='fnname'>split_at</a>(&self, mid: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>(</a>&<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>, &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>)</a></code><div class='since' title='Stable since Rust version 1.4.0'>1.4.0</div></h4>
|
||
<div class='docblock'><p>Divide one string slice into two at an index.</p>
|
||
|
||
<p>The argument, <code>mid</code>, should be a byte offset from the start of the
|
||
string. It must also be on the boundary of a UTF-8 code point.</p>
|
||
|
||
<p>The two slices returned go from the start of the string slice to <code>mid</code>,
|
||
and from <code>mid</code> to the end of the string slice.</p>
|
||
|
||
<p>To get mutable string slices instead, see the <a href="#method.split_at_mut"><code>split_at_mut()</code></a>
|
||
method.</p>
|
||
|
||
<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
|
||
<p>Panics if <code>mid</code> is not on a UTF-8 code point boundary, or if it is
|
||
beyond the last code point of the string slice.</p>
|
||
|
||
<h1 id='examples-6' class='section-header'><a href='#examples-6'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Per Martin-Löf"</span>;
|
||
|
||
<span class='kw'>let</span> (<span class='ident'>first</span>, <span class='ident'>last</span>) <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>split_at</span>(<span class='number'>3</span>);
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Per"</span>, <span class='ident'>first</span>);
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>" Martin-Löf"</span>, <span class='ident'>last</span>);</pre>
|
||
</div><h4 id='method.split_at_mut' class='method'><code>fn <a href='#method.split_at_mut' class='fnname'>split_at_mut</a>(&mut self, mid: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>(</a>&mut <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>, &mut <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a><a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>)</a></code><div class='since' title='Stable since Rust version 1.4.0'>1.4.0</div></h4>
|
||
<div class='docblock'><p>Divide one mutable string slice into two at an index.</p>
|
||
|
||
<p>The argument, <code>mid</code>, should be a byte offset from the start of the
|
||
string. It must also be on the boundary of a UTF-8 code point.</p>
|
||
|
||
<p>The two slices returned go from the start of the string slice to <code>mid</code>,
|
||
and from <code>mid</code> to the end of the string slice.</p>
|
||
|
||
<p>To get immutable string slices instead, see the <a href="#method.split_at"><code>split_at()</code></a> method.</p>
|
||
|
||
<h1 id='panics-1' class='section-header'><a href='#panics-1'>Panics</a></h1>
|
||
<p>Panics if <code>mid</code> is not on a UTF-8 code point boundary, or if it is
|
||
beyond the last code point of the string slice.</p>
|
||
|
||
<h1 id='examples-7' class='section-header'><a href='#examples-7'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Per Martin-Löf"</span>.<span class='ident'>to_string</span>();
|
||
|
||
<span class='kw'>let</span> (<span class='ident'>first</span>, <span class='ident'>last</span>) <span class='op'>=</span> <span class='ident'>s</span>.<span class='ident'>split_at_mut</span>(<span class='number'>3</span>);
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Per"</span>, <span class='ident'>first</span>);
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>" Martin-Löf"</span>, <span class='ident'>last</span>);</pre>
|
||
</div><h4 id='method.chars' class='method'><code>fn <a href='#method.chars' class='fnname'>chars</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.Chars.html' title='core::str::Chars'>Chars</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns an iterator over the <code>char</code>s of a string slice.</p>
|
||
|
||
<p>As a string slice consists of valid UTF-8, we can iterate through a
|
||
string slice by <a href="primitive.char.html"><code>char</code></a>. This method returns such an iterator.</p>
|
||
|
||
<p>It's important to remember that <a href="primitive.char.html"><code>char</code></a> represents a Unicode Scalar
|
||
Value, and may not match your idea of what a 'character' is. Iteration
|
||
over grapheme clusters may be what you actually want.</p>
|
||
|
||
<h1 id='examples-8' class='section-header'><a href='#examples-8'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>word</span> <span class='op'>=</span> <span class='string'>"goodbye"</span>;
|
||
|
||
<span class='kw'>let</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>word</span>.<span class='ident'>chars</span>().<span class='ident'>count</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>7</span>, <span class='ident'>count</span>);
|
||
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>word</span>.<span class='ident'>chars</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'g'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'o'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'o'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'d'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'b'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'y'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'e'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>chars</span>.<span class='ident'>next</span>());</pre>
|
||
|
||
<p>Remember, <a href="primitive.char.html"><code>char</code></a>s may not match your human intuition about characters:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='string'>"y̆"</span>;
|
||
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>chars</span> <span class='op'>=</span> <span class='ident'>y</span>.<span class='ident'>chars</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'y'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>()); <span class='comment'>// not 'y̆'</span>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'\u{0306}'</span>), <span class='ident'>chars</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>chars</span>.<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.char_indices' class='method'><code>fn <a href='#method.char_indices' class='fnname'>char_indices</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.CharIndices.html' title='core::str::CharIndices'>CharIndices</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns an iterator over the <a href="primitive.char.html"><code>char</code></a>s of a string slice, and their
|
||
positions.</p>
|
||
|
||
<p>As a string slice consists of valid UTF-8, we can iterate through a
|
||
string slice by <a href="primitive.char.html"><code>char</code></a>. This method returns an iterator of both
|
||
these <a href="primitive.char.html"><code>char</code></a>s, as well as their byte positions.</p>
|
||
|
||
<p>The iterator yields tuples. The position is first, the <a href="primitive.char.html"><code>char</code></a> is
|
||
second.</p>
|
||
|
||
<h1 id='examples-9' class='section-header'><a href='#examples-9'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>word</span> <span class='op'>=</span> <span class='string'>"goodbye"</span>;
|
||
|
||
<span class='kw'>let</span> <span class='ident'>count</span> <span class='op'>=</span> <span class='ident'>word</span>.<span class='ident'>char_indices</span>().<span class='ident'>count</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>7</span>, <span class='ident'>count</span>);
|
||
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>char_indices</span> <span class='op'>=</span> <span class='ident'>word</span>.<span class='ident'>char_indices</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>0</span>, <span class='string'>'g'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>1</span>, <span class='string'>'o'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>2</span>, <span class='string'>'o'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>3</span>, <span class='string'>'d'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>4</span>, <span class='string'>'b'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>5</span>, <span class='string'>'y'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>6</span>, <span class='string'>'e'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>char_indices</span>.<span class='ident'>next</span>());</pre>
|
||
|
||
<p>Remember, <a href="primitive.char.html"><code>char</code></a>s may not match your human intuition about characters:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>y</span> <span class='op'>=</span> <span class='string'>"y̆"</span>;
|
||
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>char_indices</span> <span class='op'>=</span> <span class='ident'>y</span>.<span class='ident'>char_indices</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>0</span>, <span class='string'>'y'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>()); <span class='comment'>// not (0, 'y̆')</span>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>1</span>, <span class='string'>'\u{0306}'</span>)), <span class='ident'>char_indices</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>char_indices</span>.<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.bytes' class='method'><code>fn <a href='#method.bytes' class='fnname'>bytes</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.Bytes.html' title='core::str::Bytes'>Bytes</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the bytes of a string slice.</p>
|
||
|
||
<p>As a string slice consists of a sequence of bytes, we can iterate
|
||
through a string slice by byte. This method returns such an iterator.</p>
|
||
|
||
<h1 id='examples-10' class='section-header'><a href='#examples-10'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>bytes</span> <span class='op'>=</span> <span class='string'>"bors"</span>.<span class='ident'>bytes</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>b'b'</span>), <span class='ident'>bytes</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>b'o'</span>), <span class='ident'>bytes</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>b'r'</span>), <span class='ident'>bytes</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>b's'</span>), <span class='ident'>bytes</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>bytes</span>.<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.split_whitespace' class='method'><code>fn <a href='#method.split_whitespace' class='fnname'>split_whitespace</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/rustc_unicode/u_str/struct.SplitWhitespace.html' title='rustc_unicode::u_str::SplitWhitespace'>SplitWhitespace</a></code><div class='since' title='Stable since Rust version 1.1.0'>1.1.0</div></h4>
|
||
<div class='docblock'><p>Split a string slice by whitespace.</p>
|
||
|
||
<p>The iterator returned will return string slices that are sub-slices of
|
||
the original string slice, separated by any amount of whitespace.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='examples-11' class='section-header'><a href='#examples-11'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>iter</span> <span class='op'>=</span> <span class='string'>"A few words"</span>.<span class='ident'>split_whitespace</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"A"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"few"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"words"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>iter</span>.<span class='ident'>next</span>());</pre>
|
||
|
||
<p>All kinds of whitespace are considered:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>iter</span> <span class='op'>=</span> <span class='string'>" Mary had\ta\u{2009}little \n\t lamb"</span>.<span class='ident'>split_whitespace</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"Mary"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"had"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"a"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"little"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"lamb"</span>), <span class='ident'>iter</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>iter</span>.<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.lines' class='method'><code>fn <a href='#method.lines' class='fnname'>lines</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.Lines.html' title='core::str::Lines'>Lines</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the lines of a string, as string slices.</p>
|
||
|
||
<p>Lines are ended with either a newline (<code>\n</code>) or a carriage return with
|
||
a line feed (<code>\r\n</code>).</p>
|
||
|
||
<p>The final line ending is optional.</p>
|
||
|
||
<h1 id='examples-12' class='section-header'><a href='#examples-12'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>text</span> <span class='op'>=</span> <span class='string'>"foo\r\nbar\n\nbaz\n"</span>;
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>lines</span> <span class='op'>=</span> <span class='ident'>text</span>.<span class='ident'>lines</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"foo"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"bar"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>""</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"baz"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>lines</span>.<span class='ident'>next</span>());</pre>
|
||
|
||
<p>The final line ending isn't required:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>text</span> <span class='op'>=</span> <span class='string'>"foo\nbar\n\r\nbaz"</span>;
|
||
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>lines</span> <span class='op'>=</span> <span class='ident'>text</span>.<span class='ident'>lines</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"foo"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"bar"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>""</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>"baz"</span>), <span class='ident'>lines</span>.<span class='ident'>next</span>());
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>lines</span>.<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.lines_any' class='method'><code>fn <a href='#method.lines_any' class='fnname'>lines_any</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.LinesAny.html' title='core::str::LinesAny'>LinesAny</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='stability'><em class='stab deprecated'>Deprecated since 1.4.0<p>: use lines() instead now</p>
|
||
</em></div><div class='docblock'><p>An iterator over the lines of a string.</p>
|
||
</div><h4 id='method.encode_utf16' class='method'><code>fn <a href='#method.encode_utf16' class='fnname'>encode_utf16</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/str/struct.EncodeUtf16.html' title='collections::str::EncodeUtf16'>EncodeUtf16</a></code><div class='since' title='Stable since Rust version 1.8.0'>1.8.0</div></h4>
|
||
<div class='docblock'><p>Returns an iterator of <code>u16</code> over the string encoded as UTF-16.</p>
|
||
</div><h4 id='method.contains' class='method'><code>fn <a href='#method.contains' class='fnname'>contains</a><'a, P>(&'a self, pat: P) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a sub-slice of
|
||
this string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-13' class='section-header'><a href='#examples-13'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>bananas</span> <span class='op'>=</span> <span class='string'>"bananas"</span>;
|
||
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>bananas</span>.<span class='ident'>contains</span>(<span class='string'>"nana"</span>));
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>bananas</span>.<span class='ident'>contains</span>(<span class='string'>"apples"</span>));</pre>
|
||
</div><h4 id='method.starts_with' class='method'><code>fn <a href='#method.starts_with' class='fnname'>starts_with</a><'a, P>(&'a self, pat: P) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a prefix of this
|
||
string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-14' class='section-header'><a href='#examples-14'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>bananas</span> <span class='op'>=</span> <span class='string'>"bananas"</span>;
|
||
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>bananas</span>.<span class='ident'>starts_with</span>(<span class='string'>"bana"</span>));
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>bananas</span>.<span class='ident'>starts_with</span>(<span class='string'>"nana"</span>));</pre>
|
||
</div><h4 id='method.ends_with' class='method'><code>fn <a href='#method.ends_with' class='fnname'>ends_with</a><'a, P>(&'a self, pat: P) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns <code>true</code> if the given pattern matches a suffix of this
|
||
string slice.</p>
|
||
|
||
<p>Returns <code>false</code> if it does not.</p>
|
||
|
||
<h1 id='examples-15' class='section-header'><a href='#examples-15'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>bananas</span> <span class='op'>=</span> <span class='string'>"bananas"</span>;
|
||
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>bananas</span>.<span class='ident'>ends_with</span>(<span class='string'>"anas"</span>));
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>bananas</span>.<span class='ident'>ends_with</span>(<span class='string'>"nana"</span>));</pre>
|
||
</div><h4 id='method.find' class='method'><code>fn <a href='#method.find' class='fnname'>find</a><'a, P>(&'a self, pat: P) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns the byte index of the first character of this string slice that
|
||
matches the pattern.</p>
|
||
|
||
<p>Returns <a href="option/enum.Option.html#variant.None"><code>None</code></a> if the pattern doesn't match.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='examples-16' class='section-header'><a href='#examples-16'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='string'>'L'</span>), <span class='prelude-val'>Some</span>(<span class='number'>0</span>));
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='string'>'é'</span>), <span class='prelude-val'>Some</span>(<span class='number'>14</span>));
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='string'>"Léopard"</span>), <span class='prelude-val'>Some</span>(<span class='number'>13</span>));</pre>
|
||
|
||
<p>More complex patterns with closures:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='ident'>char</span>::<span class='ident'>is_whitespace</span>), <span class='prelude-val'>Some</span>(<span class='number'>5</span>));
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='ident'>char</span>::<span class='ident'>is_lowercase</span>), <span class='prelude-val'>Some</span>(<span class='number'>1</span>));</pre>
|
||
|
||
<p>Not finding the pattern:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='string'>'1'</span>, <span class='string'>'2'</span>];
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>find</span>(<span class='ident'>x</span>), <span class='prelude-val'>None</span>);</pre>
|
||
</div><h4 id='method.rfind' class='method'><code>fn <a href='#method.rfind' class='fnname'>rfind</a><'a, P>(&'a self, pat: P) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns the byte index of the last character of this string slice that
|
||
matches the pattern.</p>
|
||
|
||
<p>Returns <a href="option/enum.Option.html#variant.None"><code>None</code></a> if the pattern doesn't match.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='examples-17' class='section-header'><a href='#examples-17'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>rfind</span>(<span class='string'>'L'</span>), <span class='prelude-val'>Some</span>(<span class='number'>13</span>));
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>rfind</span>(<span class='string'>'é'</span>), <span class='prelude-val'>Some</span>(<span class='number'>14</span>));</pre>
|
||
|
||
<p>More complex patterns with closures:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>rfind</span>(<span class='ident'>char</span>::<span class='ident'>is_whitespace</span>), <span class='prelude-val'>Some</span>(<span class='number'>12</span>));
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>rfind</span>(<span class='ident'>char</span>::<span class='ident'>is_lowercase</span>), <span class='prelude-val'>Some</span>(<span class='number'>20</span>));</pre>
|
||
|
||
<p>Not finding the pattern:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"Löwe 老虎 Léopard"</span>;
|
||
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='string'>'1'</span>, <span class='string'>'2'</span>];
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>.<span class='ident'>rfind</span>(<span class='ident'>x</span>), <span class='prelude-val'>None</span>);</pre>
|
||
</div><h4 id='method.split' class='method'><code>fn <a href='#method.split' class='fnname'>split</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.Split.html' title='core::str::Split'>Split</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of this string slice, separated by
|
||
characters matched by a pattern.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior' class='section-header'><a href='#iterator-behavior'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rsplit"><code>rsplit()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-18' class='section-header'><a href='#examples-18'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"Mary had a little lamb"</span>.<span class='ident'>split</span>(<span class='string'>' '</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"Mary"</span>, <span class='string'>"had"</span>, <span class='string'>"a"</span>, <span class='string'>"little"</span>, <span class='string'>"lamb"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>""</span>.<span class='ident'>split</span>(<span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>""</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lionXXtigerXleopard"</span>.<span class='ident'>split</span>(<span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lion"</span>, <span class='string'>""</span>, <span class='string'>"tiger"</span>, <span class='string'>"leopard"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lion::tiger::leopard"</span>.<span class='ident'>split</span>(<span class='string'>"::"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lion"</span>, <span class='string'>"tiger"</span>, <span class='string'>"leopard"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abc1def2ghi"</span>.<span class='ident'>split</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abc"</span>, <span class='string'>"def"</span>, <span class='string'>"ghi"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lionXtigerXleopard"</span>.<span class='ident'>split</span>(<span class='ident'>char</span>::<span class='ident'>is_uppercase</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lion"</span>, <span class='string'>"tiger"</span>, <span class='string'>"leopard"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abc1defXghi"</span>.<span class='ident'>split</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abc"</span>, <span class='string'>"def"</span>, <span class='string'>"ghi"</span>]);</pre>
|
||
|
||
<p>If a string contains multiple contiguous separators, you will end up
|
||
with empty strings in the output:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='string'>"||||a||b|c"</span>.<span class='ident'>to_string</span>();
|
||
<span class='kw'>let</span> <span class='ident'>d</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>split</span>(<span class='string'>'|'</span>).<span class='ident'>collect</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>d</span>, <span class='kw-2'>&</span>[<span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>"a"</span>, <span class='string'>""</span>, <span class='string'>"b"</span>, <span class='string'>"c"</span>]);</pre>
|
||
|
||
<p>Contiguous separators are separated by the empty string.</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='string'>"(///)"</span>.<span class='ident'>to_string</span>();
|
||
<span class='kw'>let</span> <span class='ident'>d</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>split</span>(<span class='string'>'/'</span>).<span class='ident'>collect</span>();;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>d</span>, <span class='kw-2'>&</span>[<span class='string'>"("</span>, <span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>")"</span>]);</pre>
|
||
|
||
<p>Separators at the start or end of a string are neighbored
|
||
by empty strings.</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>d</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"010"</span>.<span class='ident'>split</span>(<span class='string'>"0"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>d</span>, <span class='kw-2'>&</span>[<span class='string'>""</span>, <span class='string'>"1"</span>, <span class='string'>""</span>]);</pre>
|
||
|
||
<p>When the empty string is used as a separator, it separates
|
||
every character in the string, along with the beginning
|
||
and end of the string.</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>f</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"rust"</span>.<span class='ident'>split</span>(<span class='string'>""</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='kw-2'>&</span>[<span class='string'>""</span>, <span class='string'>"r"</span>, <span class='string'>"u"</span>, <span class='string'>"s"</span>, <span class='string'>"t"</span>, <span class='string'>""</span>]);</pre>
|
||
|
||
<p>Contiguous separators can lead to possibly surprising behavior
|
||
when whitespace is used as the separator. This code is correct:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='string'>" a b c"</span>.<span class='ident'>to_string</span>();
|
||
<span class='kw'>let</span> <span class='ident'>d</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>split</span>(<span class='string'>' '</span>).<span class='ident'>collect</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>d</span>, <span class='kw-2'>&</span>[<span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>""</span>, <span class='string'>"a"</span>, <span class='string'>""</span>, <span class='string'>"b"</span>, <span class='string'>"c"</span>]);</pre>
|
||
|
||
<p>It does <em>not</em> give you:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>d</span>, <span class='kw-2'>&</span>[<span class='string'>"a"</span>, <span class='string'>"b"</span>, <span class='string'>"c"</span>]);</pre>
|
||
|
||
<p>Use <a href="#method.split_whitespace"><code>split_whitespace()</code></a> for this behavior.</p>
|
||
</div><h4 id='method.rsplit' class='method'><code>fn <a href='#method.rsplit' class='fnname'>rsplit</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.RSplit.html' title='core::str::RSplit'>RSplit</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by
|
||
characters matched by a pattern and yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior-1' class='section-header'><a href='#iterator-behavior-1'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.split"><code>split()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-19' class='section-header'><a href='#examples-19'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"Mary had a little lamb"</span>.<span class='ident'>rsplit</span>(<span class='string'>' '</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lamb"</span>, <span class='string'>"little"</span>, <span class='string'>"a"</span>, <span class='string'>"had"</span>, <span class='string'>"Mary"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>""</span>.<span class='ident'>rsplit</span>(<span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>""</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lionXXtigerXleopard"</span>.<span class='ident'>rsplit</span>(<span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"leopard"</span>, <span class='string'>"tiger"</span>, <span class='string'>""</span>, <span class='string'>"lion"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lion::tiger::leopard"</span>.<span class='ident'>rsplit</span>(<span class='string'>"::"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"leopard"</span>, <span class='string'>"tiger"</span>, <span class='string'>"lion"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abc1defXghi"</span>.<span class='ident'>rsplit</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"ghi"</span>, <span class='string'>"def"</span>, <span class='string'>"abc"</span>]);</pre>
|
||
</div><h4 id='method.split_terminator' class='method'><code>fn <a href='#method.split_terminator' class='fnname'>split_terminator</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.SplitTerminator.html' title='core::str::SplitTerminator'>SplitTerminator</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by
|
||
characters matched by a pattern.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<p>Equivalent to <a href="#method.split"><code>split()</code></a>, except that the trailing substring
|
||
is skipped if empty.</p>
|
||
|
||
<p>This method can be used for string data that is <em>terminated</em>,
|
||
rather than <em>separated</em> by a pattern.</p>
|
||
|
||
<h1 id='iterator-behavior-2' class='section-header'><a href='#iterator-behavior-2'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rsplit_terminator"><code>rsplit_terminator()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-20' class='section-header'><a href='#examples-20'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"A.B."</span>.<span class='ident'>split_terminator</span>(<span class='string'>'.'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"A"</span>, <span class='string'>"B"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"A..B.."</span>.<span class='ident'>split_terminator</span>(<span class='string'>"."</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"A"</span>, <span class='string'>""</span>, <span class='string'>"B"</span>, <span class='string'>""</span>]);</pre>
|
||
</div><h4 id='method.rsplit_terminator' class='method'><code>fn <a href='#method.rsplit_terminator' class='fnname'>rsplit_terminator</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.RSplitTerminator.html' title='core::str::RSplitTerminator'>RSplitTerminator</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of <code>self</code>, separated by characters
|
||
matched by a pattern and yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a simple <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines the split.
|
||
Additional libraries might provide more complex patterns like
|
||
regular expressions.</p>
|
||
|
||
<p>Equivalent to <a href="#method.split"><code>split()</code></a>, except that the trailing substring is
|
||
skipped if empty.</p>
|
||
|
||
<p>This method can be used for string data that is <em>terminated</em>,
|
||
rather than <em>separated</em> by a pattern.</p>
|
||
|
||
<h1 id='iterator-behavior-3' class='section-header'><a href='#iterator-behavior-3'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a
|
||
reverse search, and it will be double ended if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.split_terminator"><code>split_terminator()</code></a> method can be
|
||
used.</p>
|
||
|
||
<h1 id='examples-21' class='section-header'><a href='#examples-21'>Examples</a></h1>
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"A.B."</span>.<span class='ident'>rsplit_terminator</span>(<span class='string'>'.'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"B"</span>, <span class='string'>"A"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"A..B.."</span>.<span class='ident'>rsplit_terminator</span>(<span class='string'>"."</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>""</span>, <span class='string'>"B"</span>, <span class='string'>""</span>, <span class='string'>"A"</span>]);</pre>
|
||
</div><h4 id='method.splitn' class='method'><code>fn <a href='#method.splitn' class='fnname'>splitn</a><'a, P>(&'a self, count: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.SplitN.html' title='core::str::SplitN'>SplitN</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of the given string slice, separated by a
|
||
pattern, restricted to returning at most <code>count</code> items.</p>
|
||
|
||
<p>The last element returned, if any, will contain the remainder of the
|
||
string slice.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines the
|
||
split.</p>
|
||
|
||
<h1 id='iterator-behavior-4' class='section-header'><a href='#iterator-behavior-4'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will not be double ended, because it is
|
||
not efficient to support.</p>
|
||
|
||
<p>If the pattern allows a reverse search, the <a href="#method.rsplitn"><code>rsplitn()</code></a> method can be
|
||
used.</p>
|
||
|
||
<h1 id='examples-22' class='section-header'><a href='#examples-22'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"Mary had a little lambda"</span>.<span class='ident'>splitn</span>(<span class='number'>3</span>, <span class='string'>' '</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"Mary"</span>, <span class='string'>"had"</span>, <span class='string'>"a little lambda"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lionXXtigerXleopard"</span>.<span class='ident'>splitn</span>(<span class='number'>3</span>, <span class='string'>"X"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lion"</span>, <span class='string'>""</span>, <span class='string'>"tigerXleopard"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abcXdef"</span>.<span class='ident'>splitn</span>(<span class='number'>1</span>, <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abcXdef"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>""</span>.<span class='ident'>splitn</span>(<span class='number'>1</span>, <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>""</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abc1defXghi"</span>.<span class='ident'>splitn</span>(<span class='number'>2</span>, <span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abc"</span>, <span class='string'>"defXghi"</span>]);</pre>
|
||
</div><h4 id='method.rsplitn' class='method'><code>fn <a href='#method.rsplitn' class='fnname'>rsplitn</a><'a, P>(&'a self, count: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.RSplitN.html' title='core::str::RSplitN'>RSplitN</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>An iterator over substrings of this string slice, separated by a
|
||
pattern, starting from the end of the string, restricted to returning
|
||
at most <code>count</code> items.</p>
|
||
|
||
<p>The last element returned, if any, will contain the remainder of the
|
||
string slice.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines the split.</p>
|
||
|
||
<h1 id='iterator-behavior-5' class='section-header'><a href='#iterator-behavior-5'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will not be double ended, because it is not
|
||
efficient to support.</p>
|
||
|
||
<p>For splitting from the front, the <a href="#method.splitn"><code>splitn()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-23' class='section-header'><a href='#examples-23'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"Mary had a little lamb"</span>.<span class='ident'>rsplitn</span>(<span class='number'>3</span>, <span class='string'>' '</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"lamb"</span>, <span class='string'>"little"</span>, <span class='string'>"Mary had a"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lionXXtigerXleopard"</span>.<span class='ident'>rsplitn</span>(<span class='number'>3</span>, <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"leopard"</span>, <span class='string'>"tiger"</span>, <span class='string'>"lionX"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"lion::tiger::leopard"</span>.<span class='ident'>rsplitn</span>(<span class='number'>2</span>, <span class='string'>"::"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"leopard"</span>, <span class='string'>"lion::tiger"</span>]);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abc1defXghi"</span>.<span class='ident'>rsplitn</span>(<span class='number'>2</span>, <span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"ghi"</span>, <span class='string'>"abc1def"</span>]);</pre>
|
||
</div><h4 id='method.matches' class='method'><code>fn <a href='#method.matches' class='fnname'>matches</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.Matches.html' title='core::str::Matches'>Matches</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the matches of a pattern within the given string
|
||
slice.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines if a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-6' class='section-header'><a href='#iterator-behavior-6'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rmatches"><code>rmatches()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-24' class='section-header'><a href='#examples-24'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abcXXXabcYYYabc"</span>.<span class='ident'>matches</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abc"</span>, <span class='string'>"abc"</span>, <span class='string'>"abc"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"1abc2abc3"</span>.<span class='ident'>matches</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"1"</span>, <span class='string'>"2"</span>, <span class='string'>"3"</span>]);</pre>
|
||
</div><h4 id='method.rmatches' class='method'><code>fn <a href='#method.rmatches' class='fnname'>rmatches</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.RMatches.html' title='core::str::RMatches'>RMatches</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the matches of a pattern within this string slice,
|
||
yielded in reverse order.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-7' class='section-header'><a href='#iterator-behavior-7'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.matches"><code>matches()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-25' class='section-header'><a href='#examples-25'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"abcXXXabcYYYabc"</span>.<span class='ident'>rmatches</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"abc"</span>, <span class='string'>"abc"</span>, <span class='string'>"abc"</span>]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span><span class='op'>></span> <span class='op'>=</span> <span class='string'>"1abc2abc3"</span>.<span class='ident'>rmatches</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>"3"</span>, <span class='string'>"2"</span>, <span class='string'>"1"</span>]);</pre>
|
||
</div><h4 id='method.match_indices' class='method'><code>fn <a href='#method.match_indices' class='fnname'>match_indices</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.MatchIndices.html' title='core::str::MatchIndices'>MatchIndices</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within this string
|
||
slice as well as the index that the match starts at.</p>
|
||
|
||
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
|
||
corresponding to the first match are returned.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines
|
||
if a character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-8' class='section-header'><a href='#iterator-behavior-8'>Iterator behavior</a></h1>
|
||
<p>The returned iterator will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if the pattern
|
||
allows a reverse search and forward/reverse search yields the same
|
||
elements. This is true for, eg, <a href="primitive.char.html"><code>char</code></a> but not for <code>&str</code>.</p>
|
||
|
||
<p>If the pattern allows a reverse search but its results might differ
|
||
from a forward search, the <a href="#method.rmatch_indices"><code>rmatch_indices()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-26' class='section-header'><a href='#examples-26'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"abcXXXabcYYYabc"</span>.<span class='ident'>match_indices</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>0</span>, <span class='string'>"abc"</span>), (<span class='number'>6</span>, <span class='string'>"abc"</span>), (<span class='number'>12</span>, <span class='string'>"abc"</span>)]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"1abcabc2"</span>.<span class='ident'>match_indices</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>1</span>, <span class='string'>"abc"</span>), (<span class='number'>4</span>, <span class='string'>"abc"</span>)]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"ababa"</span>.<span class='ident'>match_indices</span>(<span class='string'>"aba"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>0</span>, <span class='string'>"aba"</span>)]); <span class='comment'>// only the first `aba`</span></pre>
|
||
</div><h4 id='method.rmatch_indices' class='method'><code>fn <a href='#method.rmatch_indices' class='fnname'>rmatch_indices</a><'a, P>(&'a self, pat: P) -> <a class='struct' href='https://doc.rust-lang.org/nightly/core/str/struct.RMatchIndices.html' title='core::str::RMatchIndices'>RMatchIndices</a><'a, P> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div></h4>
|
||
<div class='docblock'><p>An iterator over the disjoint matches of a pattern within <code>self</code>,
|
||
yielded in reverse order along with the index of the match.</p>
|
||
|
||
<p>For matches of <code>pat</code> within <code>self</code> that overlap, only the indices
|
||
corresponding to the last match are returned.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if a
|
||
character matches.</p>
|
||
|
||
<h1 id='iterator-behavior-9' class='section-header'><a href='#iterator-behavior-9'>Iterator behavior</a></h1>
|
||
<p>The returned iterator requires that the pattern supports a reverse
|
||
search, and it will be a <a href="iter/trait.DoubleEndedIterator.html"><code>DoubleEndedIterator</code></a> if a forward/reverse
|
||
search yields the same elements.</p>
|
||
|
||
<p>For iterating from the front, the <a href="#method.match_indices"><code>match_indices()</code></a> method can be used.</p>
|
||
|
||
<h1 id='examples-27' class='section-header'><a href='#examples-27'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"abcXXXabcYYYabc"</span>.<span class='ident'>rmatch_indices</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>12</span>, <span class='string'>"abc"</span>), (<span class='number'>6</span>, <span class='string'>"abc"</span>), (<span class='number'>0</span>, <span class='string'>"abc"</span>)]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"1abcabc2"</span>.<span class='ident'>rmatch_indices</span>(<span class='string'>"abc"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>4</span>, <span class='string'>"abc"</span>), (<span class='number'>1</span>, <span class='string'>"abc"</span>)]);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>v</span>: <span class='ident'>Vec</span><span class='op'><</span>_<span class='op'>></span> <span class='op'>=</span> <span class='string'>"ababa"</span>.<span class='ident'>rmatch_indices</span>(<span class='string'>"aba"</span>).<span class='ident'>collect</span>();
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [(<span class='number'>2</span>, <span class='string'>"aba"</span>)]); <span class='comment'>// only the last `aba`</span></pre>
|
||
</div><h4 id='method.trim' class='method'><code>fn <a href='#method.trim' class='fnname'>trim</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with leading and trailing whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='examples-28' class='section-header'><a href='#examples-28'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>" Hello\tworld\t"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Hello\tworld"</span>, <span class='ident'>s</span>.<span class='ident'>trim</span>());</pre>
|
||
</div><h4 id='method.trim_left' class='method'><code>fn <a href='#method.trim_left' class='fnname'>trim_left</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with leading whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='text-directionality' class='section-header'><a href='#text-directionality'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Left' in this context means the first
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>right</em> side, not the left.</p>
|
||
|
||
<h1 id='examples-29' class='section-header'><a href='#examples-29'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>" Hello\tworld\t"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Hello\tworld\t"</span>, <span class='ident'>s</span>.<span class='ident'>trim_left</span>());</pre>
|
||
|
||
<p>Directionality:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>" English"</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'E'</span>) <span class='op'>==</span> <span class='ident'>s</span>.<span class='ident'>trim_left</span>().<span class='ident'>chars</span>().<span class='ident'>next</span>());
|
||
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>" עברית"</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'ע'</span>) <span class='op'>==</span> <span class='ident'>s</span>.<span class='ident'>trim_left</span>().<span class='ident'>chars</span>().<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.trim_right' class='method'><code>fn <a href='#method.trim_right' class='fnname'>trim_right</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with trailing whitespace removed.</p>
|
||
|
||
<p>'Whitespace' is defined according to the terms of the Unicode Derived
|
||
Core Property <code>White_Space</code>.</p>
|
||
|
||
<h1 id='text-directionality-1' class='section-header'><a href='#text-directionality-1'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Right' in this context means the last
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>left</em> side, not the right.</p>
|
||
|
||
<h1 id='examples-30' class='section-header'><a href='#examples-30'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>" Hello\tworld\t"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>" Hello\tworld"</span>, <span class='ident'>s</span>.<span class='ident'>trim_right</span>());</pre>
|
||
|
||
<p>Directionality:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"English "</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'h'</span>) <span class='op'>==</span> <span class='ident'>s</span>.<span class='ident'>trim_right</span>().<span class='ident'>chars</span>().<span class='ident'>rev</span>().<span class='ident'>next</span>());
|
||
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"עברית "</span>;
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>(<span class='string'>'ת'</span>) <span class='op'>==</span> <span class='ident'>s</span>.<span class='ident'>trim_right</span>().<span class='ident'>chars</span>().<span class='ident'>rev</span>().<span class='ident'>next</span>());</pre>
|
||
</div><h4 id='method.trim_matches' class='method'><code>fn <a href='#method.trim_matches' class='fnname'>trim_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.DoubleEndedSearcher.html' title='core::str::pattern::DoubleEndedSearcher'>DoubleEndedSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with all prefixes and suffixes that match a
|
||
pattern repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <a href="primitive.char.html"><code>char</code></a> or a closure that determines if a
|
||
character matches.</p>
|
||
|
||
<h1 id='examples-31' class='section-header'><a href='#examples-31'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"11foo1bar11"</span>.<span class='ident'>trim_matches</span>(<span class='string'>'1'</span>), <span class='string'>"foo1bar"</span>);
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"123foo1bar123"</span>.<span class='ident'>trim_matches</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>), <span class='string'>"foo1bar"</span>);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='string'>'1'</span>, <span class='string'>'2'</span>];
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"12foo1bar12"</span>.<span class='ident'>trim_matches</span>(<span class='ident'>x</span>), <span class='string'>"foo1bar"</span>);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"1foo1barXX"</span>.<span class='ident'>trim_matches</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>), <span class='string'>"foo1bar"</span>);</pre>
|
||
</div><h4 id='method.trim_left_matches' class='method'><code>fn <a href='#method.trim_left_matches' class='fnname'>trim_left_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with all prefixes that match a pattern
|
||
repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that determines if
|
||
a character matches.</p>
|
||
|
||
<h1 id='text-directionality-2' class='section-header'><a href='#text-directionality-2'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Left' in this context means the first
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>right</em> side, not the left.</p>
|
||
|
||
<h1 id='examples-32' class='section-header'><a href='#examples-32'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"11foo1bar11"</span>.<span class='ident'>trim_left_matches</span>(<span class='string'>'1'</span>), <span class='string'>"foo1bar11"</span>);
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"123foo1bar123"</span>.<span class='ident'>trim_left_matches</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>), <span class='string'>"foo1bar123"</span>);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='string'>'1'</span>, <span class='string'>'2'</span>];
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"12foo1bar12"</span>.<span class='ident'>trim_left_matches</span>(<span class='ident'>x</span>), <span class='string'>"foo1bar12"</span>);</pre>
|
||
</div><h4 id='method.trim_right_matches' class='method'><code>fn <a href='#method.trim_right_matches' class='fnname'>trim_right_matches</a><'a, P>(&'a self, pat: P) -> &'a <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a>, P::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Searcher</a>: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.ReverseSearcher.html' title='core::str::pattern::ReverseSearcher'>ReverseSearcher</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Returns a string slice with all suffixes that match a pattern
|
||
repeatedly removed.</p>
|
||
|
||
<p>The pattern can be a <code>&str</code>, <a href="primitive.char.html"><code>char</code></a>, or a closure that
|
||
determines if a character matches.</p>
|
||
|
||
<h1 id='text-directionality-3' class='section-header'><a href='#text-directionality-3'>Text directionality</a></h1>
|
||
<p>A string is a sequence of bytes. 'Right' in this context means the last
|
||
position of that byte string; for a language like Arabic or Hebrew
|
||
which are 'right to left' rather than 'left to right', this will be
|
||
the <em>left</em> side, not the right.</p>
|
||
|
||
<h1 id='examples-33' class='section-header'><a href='#examples-33'>Examples</a></h1>
|
||
<p>Simple patterns:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"11foo1bar11"</span>.<span class='ident'>trim_right_matches</span>(<span class='string'>'1'</span>), <span class='string'>"11foo1bar"</span>);
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"123foo1bar123"</span>.<span class='ident'>trim_right_matches</span>(<span class='ident'>char</span>::<span class='ident'>is_numeric</span>), <span class='string'>"123foo1bar"</span>);
|
||
|
||
<span class='kw'>let</span> <span class='ident'>x</span>: <span class='kw-2'>&</span>[_] <span class='op'>=</span> <span class='kw-2'>&</span>[<span class='string'>'1'</span>, <span class='string'>'2'</span>];
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"12foo1bar12"</span>.<span class='ident'>trim_right_matches</span>(<span class='ident'>x</span>), <span class='string'>"12foo1bar"</span>);</pre>
|
||
|
||
<p>A more complex pattern, using a closure:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"1fooX"</span>.<span class='ident'>trim_left_matches</span>(<span class='op'>|</span><span class='ident'>c</span><span class='op'>|</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'1'</span> <span class='op'>||</span> <span class='ident'>c</span> <span class='op'>==</span> <span class='string'>'X'</span>), <span class='string'>"fooX"</span>);</pre>
|
||
</div><h4 id='method.parse' class='method'><code>fn <a href='#method.parse' class='fnname'>parse</a><F>(&self) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html' title='core::result::Result'>Result</a><F, F::<a class='trait' href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html' title='core::str::FromStr'>Err</a>> <span class='where'>where F: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html' title='core::str::FromStr'>FromStr</a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Parses this string slice into another type.</p>
|
||
|
||
<p>Because <code>parse()</code> is so general, it can cause problems with type
|
||
inference. As such, <code>parse()</code> is one of the few times you'll see
|
||
the syntax affectionately known as the 'turbofish': <code>::<></code>. This
|
||
helps the inference algorithm understand specifically which type
|
||
you're trying to parse into.</p>
|
||
|
||
<p><code>parse()</code> can parse any type that implements the <a href="str/trait.FromStr.html"><code>FromStr</code></a> trait.</p>
|
||
|
||
<h1 id='errors' class='section-header'><a href='#errors'>Errors</a></h1>
|
||
<p>Will return <a href="str/trait.FromStr.html#associatedtype.Err"><code>Err</code></a> if it's not possible to parse this string slice into
|
||
the desired type.</p>
|
||
|
||
<h1 id='example' class='section-header'><a href='#example'>Example</a></h1>
|
||
<p>Basic usage</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>four</span>: <span class='ident'>u32</span> <span class='op'>=</span> <span class='string'>"4"</span>.<span class='ident'>parse</span>().<span class='ident'>unwrap</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='number'>4</span>, <span class='ident'>four</span>);</pre>
|
||
|
||
<p>Using the 'turbofish' instead of annotating <code>four</code>:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>four</span> <span class='op'>=</span> <span class='string'>"4"</span>.<span class='ident'>parse</span>::<span class='op'><</span><span class='ident'>u32</span><span class='op'>></span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Ok</span>(<span class='number'>4</span>), <span class='ident'>four</span>);</pre>
|
||
|
||
<p>Failing to parse:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>nope</span> <span class='op'>=</span> <span class='string'>"j"</span>.<span class='ident'>parse</span>::<span class='op'><</span><span class='ident'>u32</span><span class='op'>></span>();
|
||
|
||
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>nope</span>.<span class='ident'>is_err</span>());</pre>
|
||
</div><h4 id='method.replace' class='method'><code>fn <a href='#method.replace' class='fnname'>replace</a><'a, P>(&'a self, from: P, to: &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a> <span class='where'>where P: <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/pattern/trait.Pattern.html' title='core::str::pattern::Pattern'>Pattern</a><'a></span></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Replaces all matches of a pattern with another string.</p>
|
||
|
||
<p><code>replace</code> creates a new <a href="string/struct.String.html"><code>String</code></a>, and copies the data from this string slice into it.
|
||
While doing so, it attempts to find matches of a pattern. If it finds any, it
|
||
replaces them with the replacement string slice.</p>
|
||
|
||
<h1 id='examples-34' class='section-header'><a href='#examples-34'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"this is old"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"this is new"</span>, <span class='ident'>s</span>.<span class='ident'>replace</span>(<span class='string'>"old"</span>, <span class='string'>"new"</span>));</pre>
|
||
|
||
<p>When the pattern doesn't match:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"this is old"</span>;
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>s</span>, <span class='ident'>s</span>.<span class='ident'>replace</span>(<span class='string'>"cookie monster"</span>, <span class='string'>"little lamb"</span>));</pre>
|
||
</div><h4 id='method.to_lowercase' class='method'><code>fn <a href='#method.to_lowercase' class='fnname'>to_lowercase</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></h4>
|
||
<div class='docblock'><p>Returns the lowercase equivalent of this string slice, as a new <a href="string/struct.String.html"><code>String</code></a>.</p>
|
||
|
||
<p>'Lowercase' is defined according to the terms of the Unicode Derived Core Property
|
||
<code>Lowercase</code>.</p>
|
||
|
||
<h1 id='examples-35' class='section-header'><a href='#examples-35'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"HELLO"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"hello"</span>, <span class='ident'>s</span>.<span class='ident'>to_lowercase</span>());</pre>
|
||
|
||
<p>A tricky example, with sigma:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>sigma</span> <span class='op'>=</span> <span class='string'>"Σ"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"σ"</span>, <span class='ident'>sigma</span>.<span class='ident'>to_lowercase</span>());
|
||
|
||
<span class='comment'>// but at the end of a word, it's ς, not σ:</span>
|
||
<span class='kw'>let</span> <span class='ident'>odysseus</span> <span class='op'>=</span> <span class='string'>"ὈΔΥΣΣΕΎΣ"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"ὀδυσσεύς"</span>, <span class='ident'>odysseus</span>.<span class='ident'>to_lowercase</span>());</pre>
|
||
|
||
<p>Languages without case are not changed:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>new_year</span> <span class='op'>=</span> <span class='string'>"农历新年"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>new_year</span>, <span class='ident'>new_year</span>.<span class='ident'>to_lowercase</span>());</pre>
|
||
</div><h4 id='method.to_uppercase' class='method'><code>fn <a href='#method.to_uppercase' class='fnname'>to_uppercase</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div></h4>
|
||
<div class='docblock'><p>Returns the uppercase equivalent of this string slice, as a new <a href="string/struct.String.html"><code>String</code></a>.</p>
|
||
|
||
<p>'Uppercase' is defined according to the terms of the Unicode Derived Core Property
|
||
<code>Uppercase</code>.</p>
|
||
|
||
<h1 id='examples-36' class='section-header'><a href='#examples-36'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>s</span> <span class='op'>=</span> <span class='string'>"hello"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"HELLO"</span>, <span class='ident'>s</span>.<span class='ident'>to_uppercase</span>());</pre>
|
||
|
||
<p>Scripts without case are not changed:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>new_year</span> <span class='op'>=</span> <span class='string'>"农历新年"</span>;
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>new_year</span>, <span class='ident'>new_year</span>.<span class='ident'>to_uppercase</span>());</pre>
|
||
</div><h4 id='method.escape_debug' class='method'><code>fn <a href='#method.escape_debug' class='fnname'>escape_debug</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code></h4>
|
||
<div class='stability'><em class='stab unstable'>Unstable (<code>str_escape</code>)<p>: return type may change to be an iterator</p>
|
||
</em></div><div class='docblock'><p>Escapes each char in <code>s</code> with <code>char::escape_debug</code>.</p>
|
||
</div><h4 id='method.escape_default' class='method'><code>fn <a href='#method.escape_default' class='fnname'>escape_default</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code></h4>
|
||
<div class='stability'><em class='stab unstable'>Unstable (<code>str_escape</code>)<p>: return type may change to be an iterator</p>
|
||
</em></div><div class='docblock'><p>Escapes each char in <code>s</code> with <code>char::escape_default</code>.</p>
|
||
</div><h4 id='method.escape_unicode' class='method'><code>fn <a href='#method.escape_unicode' class='fnname'>escape_unicode</a>(&self) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code></h4>
|
||
<div class='stability'><em class='stab unstable'>Unstable (<code>str_escape</code>)<p>: return type may change to be an iterator</p>
|
||
</em></div><div class='docblock'><p>Escapes each char in <code>s</code> with <code>char::escape_unicode</code>.</p>
|
||
</div><h4 id='method.into_string' class='method'><code>fn <a href='#method.into_string' class='fnname'>into_string</a>(self: <a class='struct' href='https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html' title='alloc::boxed::Box'>Box</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>>) -> <a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a></code><div class='since' title='Stable since Rust version 1.4.0'>1.4.0</div></h4>
|
||
<div class='docblock'><p>Converts a <code>Box<str></code> into a <a href="string/struct.String.html"><code>String</code></a> without copying or allocating.</p>
|
||
|
||
<h1 id='examples-37' class='section-header'><a href='#examples-37'>Examples</a></h1>
|
||
<p>Basic usage:</p>
|
||
|
||
<pre class='rust rust-example-rendered'>
|
||
<span class='kw'>let</span> <span class='ident'>string</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>from</span>(<span class='string'>"birthday gift"</span>);
|
||
<span class='kw'>let</span> <span class='ident'>boxed_str</span> <span class='op'>=</span> <span class='ident'>string</span>.<span class='ident'>clone</span>().<span class='ident'>into_boxed_str</span>();
|
||
|
||
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>boxed_str</span>.<span class='ident'>into_string</span>(), <span class='ident'>string</span>);</pre>
|
||
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html' title='core::cmp::Eq'>Eq</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-286' class='srclink' href='../src/mime/lib.rs.html#138' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html' title='core::hash::Hash'>Hash</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-290' class='srclink' href='../src/mime/lib.rs.html#138' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.hash' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a><__H: <a class='trait' href='https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html' title='core::hash::Hasher'>Hasher</a>>(&self, __arg_0: &mut __H)</code></h4>
|
||
<div class='docblock'><p>Feeds this value into the state given, updating the hasher as necessary.</p>
|
||
</div><h4 id='method.hash_slice' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a><H>(data: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&[Self]</a>, state: &mut H) <span class='where'>where H: <a class='trait' href='https://doc.rust-lang.org/nightly/core/hash/trait.Hasher.html' title='core::hash::Hasher'>Hasher</a></span></code><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div></h4>
|
||
<div class='docblock'><p>Feeds a slice of this type into the state provided.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html' title='core::fmt::Debug'>Debug</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-296' class='srclink' href='../src/mime/lib.rs.html#138' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class='struct' href='https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -> <a class='type' href='https://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
|
||
<div class='docblock'><p>Formats the value using the given formatter.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-305' class='srclink' href='../src/mime/lib.rs.html#138' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></h4>
|
||
<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
|
||
</div><h4 id='method.clone_from' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html' title='core::ops::Deref'>Deref</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-319' class='srclink' href='../src/mime/lib.rs.html#153-158' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='associatedtype.Target' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html#associatedtype.Target' class='type'>Target</a> = <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code></h4>
|
||
<div class='docblock'><p>The resulting type after dereferencing</p>
|
||
</div><h4 id='method.deref' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&self) -> &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a></code></h4>
|
||
<div class='docblock'><p>The method called to dereference a value</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-323' class='srclink' href='../src/mime/lib.rs.html#160-168' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.eq' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: &<a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
|
||
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div><h4 id='method.ne' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: &Rhs) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a><<a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a>> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-329' class='srclink' href='../src/mime/lib.rs.html#170-174' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.eq-1' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: &<a class='struct' href='https://doc.rust-lang.org/nightly/collections/string/struct.String.html' title='collections::string::String'>String</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
|
||
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div><h4 id='method.ne-1' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: &Rhs) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-333' class='srclink' href='../src/mime/lib.rs.html#176-180' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.eq-2' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
|
||
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div><h4 id='method.ne-2' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: &Rhs) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a> <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a><&'a <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-337' class='srclink' href='../src/mime/lib.rs.html#182-186' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.eq-3' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, other: &&'a <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
|
||
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
||
</div><h4 id='method.ne-3' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, other: &Rhs) -> <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div></h4>
|
||
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html' title='core::fmt::Display'>Display</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-355' class='srclink' href='../src/mime/lib.rs.html#206-213' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='method.fmt-1' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&self, fmt: &mut <a class='struct' href='https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -> <a class='type' href='https://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
|
||
<div class='docblock'><p>Formats the value using the given formatter.</p>
|
||
</div></div><h3 class='impl'><span class='in-band'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html' title='core::str::FromStr'>FromStr</a> for <a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a></code></span><span class='out-of-band'><div class='ghost'></div><a id='src-360' class='srclink' href='../src/mime/lib.rs.html#215-223' title='goto source code'>[src]</a></span></h3>
|
||
<div class='impl-items'><h4 id='associatedtype.Err' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#associatedtype.Err' class='type'>Err</a> = <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>()</a></code></h4>
|
||
<div class='docblock'><p>The associated error which can be returned from parsing.</p>
|
||
</div><h4 id='method.from_str' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#tymethod.from_str' class='fnname'>from_str</a>(s: &<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.str.html'>str</a>) -> <a class='enum' href='https://doc.rust-lang.org/nightly/core/result/enum.Result.html' title='core::result::Result'>Result</a><<a class='enum' href='../mime/enum.Attr.html' title='mime::Attr'>Attr</a>, <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.tuple.html'>()</a>></code></h4>
|
||
<div class='docblock'><p>Parses a string <code>s</code> to return a value of this type. <a href="https://doc.rust-lang.org/nightly/core/str/trait.FromStr.html#tymethod.from_str">Read more</a></p>
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</div></div></section>
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Search functions by type signature (e.g.
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