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<p class='location'>Trait ReverseSearcher</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.next_back">next_back</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.next_match_back">next_match_back</a><a href="#method.next_reject_back">next_reject_back</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../../index.html'>core</a>::<wbr><a href='../index.html'>str</a>::<wbr><a href='index.html'>pattern</a></p><script>window.sidebarCurrent = {name: 'ReverseSearcher', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../../index.html'>core</a>::<wbr><a href='../index.html'>str</a>::<wbr><a href='index.html'>pattern</a>::<wbr><a class="trait" href=''>ReverseSearcher</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
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</span><a class='srclink' href='../../../src/core/str/pattern.rs.html#177-221' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub unsafe trait ReverseSearcher<'a>: <a class="trait" href="../../../core/str/pattern/trait.Searcher.html" title="trait core::str::pattern::Searcher">Searcher</a><'a> {
fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../core/str/pattern/enum.SearchStep.html" title="enum core::str::pattern::SearchStep">SearchStep</a>;
fn <a href='#method.next_match_back' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, usize)> { ... }
<div class='item-spacer'></div> fn <a href='#method.next_reject_back' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, usize)> { ... }
}</pre><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>pattern </code><a href="https://github.com/rust-lang/rust/issues/27721">#27721</a>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
</details></div></div><div class='docblock'><p>A reverse searcher for a string pattern.</p>
<p>This trait provides methods for searching for non-overlapping
matches of a pattern starting from the back (right) of a string.</p>
<p>It will be implemented by associated <code>Searcher</code>
types of the <code>Pattern</code> trait if the pattern supports searching
for it from the back.</p>
<p>The index ranges returned by this trait are not required
to exactly match those of the forward search in reverse.</p>
<p>For the reason why this trait is marked unsafe, see them
parent trait <code>Searcher</code>.</p>
</div>
<h2 id='required-methods' class='small-section-header'>
Required Methods<a href='#required-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='tymethod.next_back' class='method'><span id='next_back.v' class='invisible'><code>fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../core/str/pattern/enum.SearchStep.html" title="enum core::str::pattern::SearchStep">SearchStep</a></code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>pattern </code><a href="https://github.com/rust-lang/rust/issues/27721">#27721</a>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
</details></div></div><div class='docblock'><p>Performs the next search step starting from the back.</p>
<ul>
<li>Returns <code>Match(a, b)</code> if <code>haystack[a..b]</code> matches the pattern.</li>
<li>Returns <code>Reject(a, b)</code> if <code>haystack[a..b]</code> can not match the
pattern, even partially.</li>
<li>Returns <code>Done</code> if every byte of the haystack has been visited</li>
</ul>
<p>The stream of <code>Match</code> and <code>Reject</code> values up to a <code>Done</code>
will contain index ranges that are adjacent, non-overlapping,
covering the whole haystack, and laying on utf8 boundaries.</p>
<p>A <code>Match</code> result needs to contain the whole matched pattern,
however <code>Reject</code> results may be split up into arbitrary
many adjacent fragments. Both ranges may have zero length.</p>
<p>As an example, the pattern <code>"aaa"</code> and the haystack <code>"cbaaaaab"</code>
might produce the stream
<code>[Reject(7, 8), Match(4, 7), Reject(1, 4), Reject(0, 1)]</code></p>
</div></div>
<h2 id='provided-methods' class='small-section-header'>
Provided Methods<a href='#provided-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='method.next_match_back' class='method'><span id='next_match_back.v' class='invisible'><code>fn <a href='#method.next_match_back' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, usize)></code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>pattern </code><a href="https://github.com/rust-lang/rust/issues/27721">#27721</a>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
</details></div></div><div class='docblock'><p>Find the next <code>Match</code> result. See <code>next_back()</code></p>
</div><h3 id='method.next_reject_back' class='method'><span id='next_reject_back.v' class='invisible'><code>fn <a href='#method.next_reject_back' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><(usize, usize)></code></span></h3><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>pattern </code><a href="https://github.com/rust-lang/rust/issues/27721">#27721</a>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
</details></div></div><div class='docblock'><p>Find the next <code>Reject</code> result. See <code>next_back()</code></p>
</div></div>
<h2 id='implementors' class='small-section-header'>
Implementors<a href='#implementors' class='anchor'></a>
</h2>
<ul class='item-list' id='implementors-list'>
<li><div class='out-of-band'><a class='srclink' href='../../../src/core/str/pattern.rs.html#353-427' title='goto source code'>[src]</a></div><code>impl<'a> ReverseSearcher<'a> for <a class="struct" href="../../../core/str/pattern/struct.CharSearcher.html" title="struct core::str::pattern::CharSearcher">CharSearcher</a><'a></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../../src/core/str/pattern.rs.html#649-651' title='goto source code'>[src]</a></div><code>impl<'a, 'b> ReverseSearcher<'a> for <a class="struct" href="../../../core/str/pattern/struct.CharSliceSearcher.html" title="struct core::str::pattern::CharSliceSearcher">CharSliceSearcher</a><'a, 'b></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../../src/core/str/pattern.rs.html#685-689' title='goto source code'>[src]</a></div><code>impl<'a, F> ReverseSearcher<'a> for <a class="struct" href="../../../core/str/pattern/struct.CharPredicateSearcher.html" title="struct core::str::pattern::CharPredicateSearcher">CharPredicateSearcher</a><'a, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(char) -> bool, </span></code></li>
<li><div class='out-of-band'><a class='srclink' href='../../../src/core/str/pattern.rs.html#874-941' title='goto source code'>[src]</a></div><code>impl<'a, 'b> ReverseSearcher<'a> for <a class="struct" href="../../../core/str/pattern/struct.StrSearcher.html" title="struct core::str::pattern::StrSearcher">StrSearcher</a><'a, 'b></code></li>
</ul><script type="text/javascript" async
src="../../../implementors/core/str/pattern/trait.ReverseSearcher.js">
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