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<p class='location'>Struct Captures</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.get">get</a><a href="#method.name">name</a><a href="#method.iter">iter</a><a href="#method.expand">expand</a><a href="#method.len">len</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Index%3Cusize%3E">Index<usize></a><a href="#impl-Index%3C%26%27i%20str%3E">Index<&'i str></a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='../index.html'>regex</a>::<wbr><a href='index.html'>bytes</a></p><script>window.sidebarCurrent = {name: 'Captures', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>regex</a>::<wbr><a href='index.html'>bytes</a>::<wbr><a class="struct" href=''>Captures</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 class='srclink' href='../../src/regex/re_bytes.rs.html#783-787' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Captures<'t> { /* fields omitted */ }</pre></div><div class='docblock'><p>Captures represents a group of captured byte strings for a single match.</p>
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<p>The 0th capture always corresponds to the entire match. Each subsequent
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index corresponds to the next capture group in the regex. If a capture
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group is named, then the matched byte string is <em>also</em> available via the
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<code>name</code> method. (Note that the 0th capture is always unnamed and so must be
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accessed with the <code>get</code> method.)</p>
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<p>Positions returned from a capture group are always byte indices.</p>
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<p><code>'t</code> is the lifetime of the matched text.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t> <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#789-859' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.get' class="method"><span id='get.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.get' class='fnname'>get</a>(&self, i: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../regex/bytes/struct.Match.html" title="struct regex::bytes::Match">Match</a><'t>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#809-811' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the match associated with the capture group at index <code>i</code>. If
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<code>i</code> does not correspond to a capture group, or if the capture group
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did not participate in the match, then <code>None</code> is returned.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Get the text of the match with a default of an empty string if this
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group didn't participate in the match:</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">re</span> <span class="op">=</span> <span class="ident">Regex</span>::<span class="ident">new</span>(<span class="string">r"[a-z]+(?:([0-9]+)|([A-Z]+))"</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">caps</span> <span class="op">=</span> <span class="ident">re</span>.<span class="ident">captures</span>(<span class="string">b"abc123"</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">text1</span> <span class="op">=</span> <span class="ident">caps</span>.<span class="ident">get</span>(<span class="number">1</span>).<span class="ident">map_or</span>(<span class="kw-2">&</span><span class="string">b""</span>[..], <span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_bytes</span>());
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<span class="kw">let</span> <span class="ident">text2</span> <span class="op">=</span> <span class="ident">caps</span>.<span class="ident">get</span>(<span class="number">2</span>).<span class="ident">map_or</span>(<span class="kw-2">&</span><span class="string">b""</span>[..], <span class="op">|</span><span class="ident">m</span><span class="op">|</span> <span class="ident">m</span>.<span class="ident">as_bytes</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">text1</span>, <span class="kw-2">&</span><span class="string">b"123"</span>[..]);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">text2</span>, <span class="kw-2">&</span><span class="string">b""</span>[..]);</pre>
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</div><h4 id='method.name' class="method"><span id='name.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.name' class='fnname'>name</a>(&self, name: &<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/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../regex/bytes/struct.Match.html" title="struct regex::bytes::Match">Match</a><'t>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#815-817' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the match for the capture group named <code>name</code>. If <code>name</code> isn't a
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valid capture group or didn't match anything, then <code>None</code> is returned.</p>
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</div><h4 id='method.iter' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../regex/bytes/struct.SubCaptureMatches.html" title="struct regex::bytes::SubCaptureMatches">SubCaptureMatches</a><'c, 't></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../regex/bytes/struct.SubCaptureMatches.html" title="struct regex::bytes::SubCaptureMatches">SubCaptureMatches</a><'c, 't></h3><code class="content"><span class="where fmt-newline">impl<'c, 't> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="../../regex/bytes/struct.SubCaptureMatches.html" title="struct regex::bytes::SubCaptureMatches">SubCaptureMatches</a><'c, 't></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../regex/bytes/struct.Match.html" title="struct regex::bytes::Match">Match</a><'t>>;</span></code></div></div><span id='iter.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.iter' class='fnname'>iter</a><'c>(&'c self) -> <a class="struct" href="../../regex/bytes/struct.SubCaptureMatches.html" title="struct regex::bytes::SubCaptureMatches">SubCaptureMatches</a><'c, 't></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#824-829' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>An iterator that yields all capturing matches in the order in which
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they appear in the regex. If a particular capture group didn't
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participate in the match, then <code>None</code> is yielded for that capture.</p>
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<p>The first match always corresponds to the overall match of the regex.</p>
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</div><h4 id='method.expand' class="method"><span id='expand.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.expand' class='fnname'>expand</a>(&self, replacement: <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>, dst: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#847-849' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Expands all instances of <code>$name</code> in <code>replacement</code> to the corresponding
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capture group <code>name</code>, and writes them to the <code>dst</code> buffer given.</p>
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<p><code>name</code> may be an integer corresponding to the index of the
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capture group (counted by order of opening parenthesis where <code>0</code> is the
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entire match) or it can be a name (consisting of letters, digits or
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underscores) corresponding to a named capture group.</p>
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<p>If <code>name</code> isn't a valid capture group (whether the name doesn't exist
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or isn't a valid index), then it is replaced with the empty string.</p>
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<p>The longest possible name is used. e.g., <code>$1a</code> looks up the capture
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group named <code>1a</code> and not the capture group at index <code>1</code>. To exert more
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precise control over the name, use braces, e.g., <code>${1}a</code>.</p>
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<p>To write a literal <code>$</code> use <code>$$</code>.</p>
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</div><h4 id='method.len' class="method"><span id='len.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub 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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#856-858' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the number of captured groups.</p>
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<p>This is always at least <code>1</code>, since every regex has at least one capture
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group that corresponds to the full match.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<div id='implementations-list'>
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<h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#861-865' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#862-864' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Index%3Cusize%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> for <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl-Index%3Cusize%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#914-921' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Get a group by index.</p>
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<p><code>'t</code> is the lifetime of the matched text.</p>
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<p>The text can't outlive the <code>Captures</code> object if this method is
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used, because of how <code>Index</code> is defined (normally <code>a[i]</code> is part
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of <code>a</code> and can't outlive it); to do that, use <code>get()</code> instead.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>If there is no group at the given index.</p>
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</div><div class='impl-items'><h4 id='associatedtype.Output' class="type"><span id='Output.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <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></span></h4>
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<div class='docblock'><p>The returned type after indexing.</p>
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</div><h4 id='method.index' class="method"><span id='index.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a>(&self, i: <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.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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#917-920' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the indexing (<code>container[index]</code>) operation.</p>
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</div></div><h3 id='impl-Index%3C%26%27i%20str%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t, 'i> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html" title="trait core::ops::index::Index">Index</a><&'i <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>> for <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl-Index%3C%26%27i%20str%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#935-942' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='docblock'><p>Get a group by name.</p>
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<p><code>'t</code> is the lifetime of the matched text and <code>'i</code> is the lifetime
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of the group name (the index).</p>
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<p>The text can't outlive the <code>Captures</code> object if this method is
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used, because of how <code>Index</code> is defined (normally <code>a[i]</code> is part
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of <code>a</code> and can't outlive it); to do that, use <code>name</code> instead.</p>
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<h1 id="panics-1" class="section-header"><a href="#panics-1">Panics</a></h1>
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<p>If there is no group named by the given value.</p>
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</div><div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><span id='Output.t-1' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#associatedtype.Output' class="type">Output</a> = <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></span></h4>
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<div class='docblock'><p>The returned type after indexing.</p>
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</div><h4 id='method.index-1' class="method"><span id='index.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/index/trait.Index.html#tymethod.index' class='fnname'>index</a><'a>(&'a self, name: &'i <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.slice.html">&'a [</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></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#938-941' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs the indexing (<code>container[index]</code>) operation.</p>
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</div></div></div>
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<h2 id='synthetic-implementations' class='small-section-header'>
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Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a>
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</h2>
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<div id='synthetic-implementations-list'>
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<h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'t> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a><'t></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'></span></td></tr></tbody></table></h3><div class='impl-items'></div></div></section>
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<h1 class="hidden">Help</h1>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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