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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="Returns a reverse iterator over all non-overlapping occurrences of a substring in a haystack."><title>rfind_iter in memchr::memmem - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-ca0dd0c4.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="memchr" data-themes="" data-resource-suffix="" data-rustdoc-version="1.93.1 (01f6ddf75 2026-02-11) (Arch Linux rust 1:1.93.1-1)" data-channel="1.93.1" data-search-js="search-9e2438ea.js" data-stringdex-js="stringdex-a3946164.js" data-settings-js="settings-c38705f0.js" ><script src="../../static.files/storage-e2aeef58.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-a410ff4d.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-263c88ec.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><rustdoc-topbar><h2><a href="#">rfind_iter</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../memchr/index.html">memchr</a><span class="version">2.8.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">rfind_<wbr>iter</a></h2><h3><a href="#">Sections</a></h3><ul class="block top-toc"><li><a href="#complexity" title="Complexity">Complexity</a></li><li><a href="#examples" title="Examples">Examples</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="index.html">In memchr::<wbr>memmem</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">memchr</a>::<wbr><a href="index.html">memmem</a></div><h1>Function <span class="fn">rfind_<wbr>iter</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/memchr/memmem/mod.rs.html#150-155">Source</a> </span></div><pre class="rust item-decl"><code>pub fn rfind_iter<'h, 'n, N: 'n + ?<a class="trait" href="https://doc.rust-lang.org/1.93.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/1.93.1/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><[<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>]>>(
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haystack: &'h [<a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.u8.html">u8</a>],
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needle: <a class="primitive" href="https://doc.rust-lang.org/1.93.1/std/primitive.reference.html">&'n N</a>,
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) -> <a class="struct" href="struct.FindRevIter.html" title="struct memchr::memmem::FindRevIter">FindRevIter</a><'h, 'n> <a href="#" class="tooltip" data-notable-ty="FindRevIter<'h, 'n>">ⓘ</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returns a reverse iterator over all non-overlapping occurrences of a
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substring in a haystack.</p>
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<h2 id="complexity"><a class="doc-anchor" href="#complexity">§</a>Complexity</h2>
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<p>This routine is guaranteed to have worst case linear time complexity
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with respect to both the needle and the haystack. That is, this runs
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in <code>O(needle.len() + haystack.len())</code> time.</p>
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<p>This routine is also guaranteed to have worst case constant space
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complexity.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>Basic usage:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>memchr::memmem;
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<span class="kw">let </span>haystack = <span class="string">b"foo bar foo baz foo"</span>;
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<span class="kw">let </span><span class="kw-2">mut </span>it = memmem::rfind_iter(haystack, <span class="string">b"foo"</span>);
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">16</span>), it.next());
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">8</span>), it.next());
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), it.next());
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<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, it.next());</code></pre></div></div></details><script type="text/json" id="notable-traits-data">{"FindRevIter<'h, 'n>":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.FindRevIter.html\" title=\"struct memchr::memmem::FindRevIter\">FindRevIter</a><'h, 'n></code></h3><pre><code><div class=\"where\">impl<'h, 'n> <a class=\"trait\" href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html\" title=\"trait core::iter::traits::iterator::Iterator\">Iterator</a> for <a class=\"struct\" href=\"struct.FindRevIter.html\" title=\"struct memchr::memmem::FindRevIter\">FindRevIter</a><'h, 'n></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.93.1/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.93.1/std/primitive.usize.html\">usize</a>;</div>"}</script></section></div></main></body></html> |