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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `ReverseSearcher` trait in crate `nom`."><meta name="keywords" content="rust, rustlang, rust-lang, ReverseSearcher"><title>nom::lib::std::str::pattern::ReverseSearcher - Rust</title><link rel="stylesheet" type="text/css" href="../../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../../light.css" id="themeStyle"><script src="../../../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../../../../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../../nom/index.html'><div class='logo-container'><img src='../../../../../rust-logo.png' alt='logo'></div></a><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'>nom</a>::<wbr><a href='../../../index.html'>lib</a>::<wbr><a href='../../index.html'>std</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></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../../../settings.html"><img src="../../../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><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>]</a></span><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#164-208' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../../../../index.html'>nom</a>::<wbr><a href='../../../index.html'>lib</a>::<wbr><a href='../../index.html'>std</a>::<wbr><a href='../index.html'>str</a>::<wbr><a href='index.html'>pattern</a>::<wbr><a class="trait" href=''>ReverseSearcher</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub unsafe trait ReverseSearcher<'a>: <a class="trait" href="../../../../../nom/lib/std/str/pattern/trait.Searcher.html" title="trait nom::lib::std::str::pattern::Searcher">Searcher</a><'a> {
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fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a>;
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fn <a href='#method.next_match_back' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>> { ... }
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<div class='item-spacer'></div> fn <a href='#method.next_reject_back' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>> { ... }
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}</pre></div><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><div class='docblock'><p>A reverse searcher for a string pattern.</p>
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<p>This trait provides methods for searching for non-overlapping
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matches of a pattern starting from the back (right) of a string.</p>
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<p>It will be implemented by associated <code>Searcher</code>
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types of the <code>Pattern</code> trait if the pattern supports searching
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for it from the back.</p>
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<p>The index ranges returned by this trait are not required
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to exactly match those of the forward search in reverse.</p>
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<p>For the reason why this trait is marked unsafe, see them
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parent trait <code>Searcher</code>.</p>
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</div>
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<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'><code id='next_back.v'>fn <a href='#tymethod.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a></code></h3><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><div class='docblock'><p>Performs the next search step starting from the back.</p>
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<ul>
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<li>Returns <code>Match(a, b)</code> if <code>haystack[a..b]</code> matches the pattern.</li>
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<li>Returns <code>Reject(a, b)</code> if <code>haystack[a..b]</code> can not match the
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pattern, even partially.</li>
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<li>Returns <code>Done</code> if every byte of the haystack has been visited</li>
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</ul>
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<p>The stream of <code>Match</code> and <code>Reject</code> values up to a <code>Done</code>
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will contain index ranges that are adjacent, non-overlapping,
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covering the whole haystack, and laying on utf8 boundaries.</p>
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<p>A <code>Match</code> result needs to contain the whole matched pattern,
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however <code>Reject</code> results may be split up into arbitrary
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many adjacent fragments. Both ranges may have zero length.</p>
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<p>As an example, the pattern <code>"aaa"</code> and the haystack <code>"cbaaaaab"</code>
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might produce the stream
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<code>[Reject(7, 8), Match(4, 7), Reject(1, 4), Reject(0, 1)]</code></p>
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</div></div><span class='loading-content'>Loading content...</span>
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<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'><code id='next_match_back.v'>fn <a href='#method.next_match_back' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code></h3><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><div class='docblock'><p>Finds the next <code>Match</code> result. See <code>next_back()</code></p>
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</div><h3 id='method.next_reject_back' class='method'><code id='next_reject_back.v'>fn <a href='#method.next_reject_back' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code></h3><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><div class='docblock'><p>Finds the next <code>Reject</code> result. See <code>next_back()</code></p>
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</div></div><span class='loading-content'>Loading content...</span>
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<h2 id='implementors' class='small-section-header'>Implementors<a href='#implementors' class='anchor'></a></h2><div class='item-list' id='implementors-list'><h3 id='impl-ReverseSearcher%3C%27a%3E' class='impl'><code class='in-band'>impl<'a> ReverseSearcher<'a> for <a class="struct" href="../../../../../nom/lib/std/str/pattern/struct.CharSearcher.html" title="struct nom::lib::std::str::pattern::CharSearcher">CharSearcher</a><'a></code><a href='#impl-ReverseSearcher%3C%27a%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#342-418' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back' class="method hidden"><code id='next_back.v-1'>fn <a href='#method.next_back' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#344-362' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_match_back-1' class="method hidden"><code id='next_match_back.v-1'>fn <a href='#method.next_match_back-1' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#364-415' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div></div><h3 id='impl-ReverseSearcher%3C%27a%3E-1' class='impl'><code class='in-band'>impl<'a, 'b> ReverseSearcher<'a> for <a class="struct" href="../../../../../nom/lib/std/str/pattern/struct.CharSliceSearcher.html" title="struct nom::lib::std::str::pattern::CharSliceSearcher">CharSliceSearcher</a><'a, 'b></code><a href='#impl-ReverseSearcher%3C%27a%3E-1' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#634-636' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-1' class="method hidden"><code id='next_back.v-2'>fn <a href='#method.next_back-1' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#606-608' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_match_back-2' class="method hidden"><code id='next_match_back.v-2'>fn <a href='#method.next_match_back-2' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#610-612' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_reject_back-1' class="method hidden"><code id='next_reject_back.v-1'>fn <a href='#method.next_reject_back-1' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#614-616' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div></div><h3 id='impl-ReverseSearcher%3C%27a%3E-2' class='impl'><code class='in-band'>impl<'a, 'b> ReverseSearcher<'a> for <a class="struct" href="../../../../../nom/lib/std/str/pattern/struct.StrSearcher.html" title="struct nom::lib::std::str::pattern::StrSearcher">StrSearcher</a><'a, 'b></code><a href='#impl-ReverseSearcher%3C%27a%3E-2' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#865-935' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-2' class="method hidden"><code id='next_back.v-3'>fn <a href='#method.next_back-2' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#867-904' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_match_back-3' class="method hidden"><code id='next_match_back.v-3'>fn <a href='#method.next_match_back-3' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#907-934' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div></div><h3 id='impl-ReverseSearcher%3C%27a%3E-3' class='impl'><code class='in-band'>impl<'a, F> ReverseSearcher<'a> for <a class="struct" href="../../../../../nom/lib/std/str/pattern/struct.CharPredicateSearcher.html" title="struct nom::lib::std::str::pattern::CharPredicateSearcher">CharPredicateSearcher</a><'a, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../../../../nom/lib/std/prelude/v1/v1/trait.FnMut.html" title="trait nom::lib::std::prelude::v1::v1::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, </span></code><a href='#impl-ReverseSearcher%3C%27a%3E-3' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#673-678' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.next_back-3' class="method hidden"><code id='next_back.v-4'>fn <a href='#method.next_back-3' class='fnname'>next_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/str/pattern/enum.SearchStep.html" title="enum nom::lib::std::str::pattern::SearchStep">SearchStep</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#606-608' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_match_back-4' class="method hidden"><code id='next_match_back.v-4'>fn <a href='#method.next_match_back-4' class='fnname'>next_match_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#610-612' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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</details></div></div><h4 id='method.next_reject_back-2' class="method hidden"><code id='next_reject_back.v-2'>fn <a href='#method.next_reject_back-2' class='fnname'>next_reject_back</a>(&mut self) -> <a class="enum" href="../../../../../nom/lib/std/prelude/v1/v1/enum.Option.html" title="enum nom::lib::std::prelude::v1::v1::Option">Option</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.usize.html">usize</a>, <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>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/str/pattern.rs.html#614-616' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>pattern</code>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
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