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<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>
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<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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<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='regex::bytes::Captures'>Captures</a>, dst: &mut <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::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='core::option::Option'>Option</a><<a class='enum' href='https://doc.rust-lang.org/nightly/collections/borrow/enum.Cow.html' title='collections::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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}</pre><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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<h2 id='required-methods'>Required Methods</h2>
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<h3 id='tymethod.replace_append' class='method stab '><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='regex::bytes::Captures'>Captures</a>, dst: &mut <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a><<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.u8.html'>u8</a>>)</code></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.at(0).unwrap())</code>.</p>
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</div></div>
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<h2 id='provided-methods'>Provided Methods</h2>
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<h3 id='method.no_expansion' class='method stab '><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='core::option::Option'>Option</a><<a class='enum' href='https://doc.rust-lang.org/nightly/collections/borrow/enum.Cow.html' title='collections::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></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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<h2 id='implementors'>Implementors</h2>
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<ul class='item-list' id='implementors-list'>
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<li><code>impl<'a> Replacer 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></li>
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<li><code>impl<'a> Replacer for <a class='struct' href='../../regex/bytes/struct.NoExpand.html' title='regex::bytes::NoExpand'>NoExpand</a><'a></code></li>
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