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20 lines
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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 the index of the first occurrence of the given needle."><meta name="keywords" content="rust, rustlang, rust-lang, find"><title>find in memchr::memmem - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><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="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.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">☰</button><a class="sidebar-logo" href="../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In memchr::memmem</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../memchr/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="../index.html">memchr</a>::<wbr><a href="index.html">memmem</a>::<wbr><a class="fn" href="#">find</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../../src/memchr/memmem/mod.rs.html#259-265">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn find(haystack: &[<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>], needle: &[<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.u8.html">u8</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.usize.html">usize</a>></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returns the index of the first occurrence of the given needle.</p>
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<p>Note that if you’re are searching for the same needle in many different
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small haystacks, it may be faster to initialize a <a href="struct.Finder.html" title="Finder"><code>Finder</code></a> once,
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and reuse it for each search.</p>
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<h2 id="complexity"><a href="#complexity">Complexity</a></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 href="#examples">Examples</a></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> <span class="ident">memchr::memmem</span>;
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<span class="kw">let</span> <span class="ident">haystack</span> <span class="op">=</span> <span class="string">b"foo bar baz"</span>;
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<span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), <span class="ident">memmem::find</span>(<span class="ident">haystack</span>, <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">4</span>), <span class="ident">memmem::find</span>(<span class="ident">haystack</span>, <span class="string">b"bar"</span>));
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<span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, <span class="ident">memmem::find</span>(<span class="ident">haystack</span>, <span class="string">b"quux"</span>));</code></pre></div>
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