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<title>regex::bytes::Replacer - Rust</title>
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<p class='location'>Trait Replacer</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.replace_append">replace_append</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.no_expansion">no_expansion</a><a href="#method.by_ref">by_ref</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Replacer">&'a [u8]</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>regex</a>::<wbr><a href='index.html'>bytes</a></p><script>window.sidebarCurrent = {name: 'Replacer', ty: 'trait', 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'>Trait <a href='../index.html'>regex</a>::<wbr><a href='index.html'>bytes</a>::<wbr><a class="trait" href=''>Replacer</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/regex/re_bytes.rs.html#973-1018' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust trait'>pub trait Replacer {
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fn <a href='#tymethod.replace_append' class='fnname'>replace_append</a>(&mut self, caps: &<a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</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>>);
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fn <a href='#method.no_expansion' class='fnname'>no_expansion</a><'r>(&'r mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="https://doc.rust-lang.org/nightly/alloc/borrow/enum.Cow.html" title="enum alloc::borrow::Cow">Cow</a><'r, <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>>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.by_ref' class='fnname'>by_ref</a><'r>(&'r mut self) -> <a class="struct" href="../../regex/bytes/struct.ReplacerRef.html" title="struct regex::bytes::ReplacerRef">ReplacerRef</a><'r, Self> { ... }
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}</pre></div><div class='docblock'><p>Replacer describes types that can be used to replace matches in a byte
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string.</p>
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<p>In general, users of this crate shouldn't need to implement this trait,
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since implementations are already provided for <code>&[u8]</code> and
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<code>FnMut(&Captures) -> Vec<u8></code>, which covers most use cases.</p>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.replace_append' class='method'><span id='replace_append.v' class='invisible'><code>fn <a href='#tymethod.replace_append' class='fnname'>replace_append</a>(&mut self, caps: &<a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</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></h3><div class='docblock'><p>Appends text to <code>dst</code> to replace the current match.</p>
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<p>The current match is represented by <code>caps</code>, which is guaranteed to
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have a match at capture group <code>0</code>.</p>
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<p>For example, a no-op replacement would be
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<code>dst.extend(&caps[0])</code>.</p>
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</div></div>
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<h2 id='provided-methods' class='small-section-header'>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='method.no_expansion' class='method'><span id='no_expansion.v' class='invisible'><code>fn <a href='#method.no_expansion' class='fnname'>no_expansion</a><'r>(&'r mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="https://doc.rust-lang.org/nightly/alloc/borrow/enum.Cow.html" title="enum alloc::borrow::Cow">Cow</a><'r, <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></h3><div class='docblock'><p>Return a fixed unchanging replacement byte string.</p>
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<p>When doing replacements, if access to <code>Captures</code> is not needed (e.g.,
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the replacement byte string does not need <code>$</code> expansion), then it can
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be beneficial to avoid finding sub-captures.</p>
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<p>In general, this is called once for every call to <code>replacen</code>.</p>
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</div><h3 id='method.by_ref' class='method'><span id='by_ref.v' class='invisible'><code>fn <a href='#method.by_ref' class='fnname'>by_ref</a><'r>(&'r mut self) -> <a class="struct" href="../../regex/bytes/struct.ReplacerRef.html" title="struct regex::bytes::ReplacerRef">ReplacerRef</a><'r, Self></code></span></h3><div class='docblock'><p>Return a <code>Replacer</code> that borrows and wraps this <code>Replacer</code>.</p>
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<p>This is useful when you want to take a generic <code>Replacer</code> (which might
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not be cloneable) and use it without consuming it, so it can be used
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more than once.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">regex</span>::<span class="ident">bytes</span>::{<span class="ident">Regex</span>, <span class="ident">Replacer</span>};
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<span class="kw">fn</span> <span class="ident">replace_all_twice</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Replacer</span><span class="op">></span>(
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<span class="ident">re</span>: <span class="ident">Regex</span>,
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<span class="ident">src</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>],
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<span class="kw-2">mut</span> <span class="ident">rep</span>: <span class="ident">R</span>,
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) <span class="op">-></span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">dst</span> <span class="op">=</span> <span class="ident">re</span>.<span class="ident">replace_all</span>(<span class="ident">src</span>, <span class="ident">rep</span>.<span class="ident">by_ref</span>());
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<span class="kw">let</span> <span class="ident">dst</span> <span class="op">=</span> <span class="ident">re</span>.<span class="ident">replace_all</span>(<span class="kw-2">&</span><span class="ident">dst</span>, <span class="ident">rep</span>.<span class="ident">by_ref</span>());
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<span class="ident">dst</span>.<span class="ident">into_owned</span>()
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}</pre>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-Replacer' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<'a> <a class="trait" href="../../regex/bytes/trait.Replacer.html" title="trait regex::bytes::Replacer">Replacer</a> for <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><a href='#impl-Replacer' 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#1035-1046' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><span class='docblock autohide'><div class='impl-items'><h4 id='method.replace_append' class="method"><span id='replace_append.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.replace_append' class='fnname'>replace_append</a>(&mut self, caps: &<a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</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#1036-1038' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.no_expansion-1' class="method"><span id='no_expansion.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='#method.no_expansion' class='fnname'>no_expansion</a>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="https://doc.rust-lang.org/nightly/alloc/borrow/enum.Cow.html" title="enum alloc::borrow::Cow">Cow</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#1040-1045' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><h4 id='method.by_ref-1' class="method"><span id='by_ref.v-1' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../regex/bytes/trait.Replacer.html#method.by_ref' class='fnname'>by_ref</a><'r>(&'r mut self) -> <a class="struct" href="../../regex/bytes/struct.ReplacerRef.html" title="struct regex::bytes::ReplacerRef">ReplacerRef</a><'r, Self></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/regex/re_bytes.rs.html#1015-1017' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4></div></span>
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<ul class='item-list' id='implementors-list'>
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<li><table class='table-display'><tbody><tr><td><code>impl<'a, R: <a class="trait" href="../../regex/bytes/trait.Replacer.html" title="trait regex::bytes::Replacer">Replacer</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + 'a> Replacer for <a class="struct" href="../../regex/bytes/struct.ReplacerRef.html" title="struct regex::bytes::ReplacerRef">ReplacerRef</a><'a, R></code><td><div class='out-of-band'><a class='srclink' href='../../src/regex/re_bytes.rs.html#1026-1033' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl<F> Replacer for F <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../../regex/bytes/struct.Captures.html" title="struct regex::bytes::Captures">Captures</a>) -> <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>>, </span></code><td><div class='out-of-band'><a class='srclink' href='../../src/regex/re_bytes.rs.html#1048-1052' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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<li><table class='table-display'><tbody><tr><td><code>impl<'t> Replacer for <a class="struct" href="../../regex/bytes/struct.NoExpand.html" title="struct regex::bytes::NoExpand">NoExpand</a><'t></code><td><div class='out-of-band'><a class='srclink' href='../../src/regex/re_bytes.rs.html#1064-1072' title='goto source code'>[src]</a></div></td></tr></tbody></table></li>
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</ul><script type="text/javascript">window.inlined_types=new Set([]);</script><script type="text/javascript" async
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