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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-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.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="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.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]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../memchr/index.html">memchr</a><span class="version">2.7.4</span></h2></div><div class="sidebar-elems"><h2><a href="index.html">In memchr::memmem</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Function <a href="../index.html">memchr</a>::<wbr><a href="index.html">memmem</a>::<wbr><a class="fn" href="#">rfind_iter</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/memchr/memmem/mod.rs.html#150-155">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub fn rfind_iter&lt;'h, 'n, N: 'n + ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a>&lt;[<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>]&gt;&gt;(
haystack: &amp;'h [<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.u8.html">u8</a>],
needle: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;'n N</a>,
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
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) -&gt; <a class="struct" href="struct.FindRevIter.html" title="struct memchr::memmem::FindRevIter">FindRevIter</a>&lt;'h, 'n&gt; <a href="#" class="tooltip" data-notable-ty="FindRevIter&lt;&#39;h, &#39;n&gt;">ⓘ</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
substring in a haystack.</p>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
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<h2 id="complexity"><a class="doc-anchor" href="#complexity">§</a>Complexity</h2>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
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<p>This routine is guaranteed to have worst case linear time complexity
with respect to both the needle and the haystack. That is, this runs
in <code>O(needle.len() + haystack.len())</code> time.</p>
<p>This routine is also guaranteed to have worst case constant space
complexity.</p>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
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<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>memchr::memmem;
<span class="kw">let </span>haystack = <span class="string">b"foo bar foo baz foo"</span>;
<span class="kw">let </span><span class="kw-2">mut </span>it = memmem::rfind_iter(haystack, <span class="string">b"foo"</span>);
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">16</span>), it.next());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">8</span>), it.next());
<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), it.next());
<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, it.next());</code></pre></div>
deploy: b3bd34a9bbae9c73eb2d66a212d6921bd7499b69
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</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>&lt;'h, 'n&gt;</code></h3><pre><code><div class=\"where\">impl&lt;'h, 'n&gt; <a class=\"trait\" href=\"https://doc.rust-lang.org/1.80.0/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>&lt;'h, 'n&gt;</div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/1.80.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item\" class=\"associatedtype\">Item</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/1.80.0/std/primitive.usize.html\">usize</a>;</div>"}</script></section></div></main></body></html>
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