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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>strstr</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">Standard C String and Character</a> > <a href= "strstr.html">strstr</a> </div> <div class="name-format"> strstr </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <string.h> char *strstr( const char *str1, const char *str2 );</pre> <p>The function strstr() returns a pointer to the first occurrence of <em>str2</em> in <em>str1</em>, or <strong>NULL</strong> if no match is found. If the length of <em>str2</em> is zero, then strstr() will simply return <em>str1</em>. </p> <p>For example, the following code checks for the existence of one string within another string:</p> <pre class="example-code"> char* str1 = "this is a string of characters"; char* str2 = "a string"; char* result = strstr( str1, str2 ); if( result == NULL ) printf( "Could not find '%s' in '%s'\n", str2, str1 ); else printf( "Found a substring: '%s'\n", result );</pre> <p>When run, the above code displays this output:</p> <pre class="example-code"> Found a substring: 'a string of characters'</pre> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="memchr.html">memchr</a><br> <a href="strchr.html">strchr</a><br> <a href="strcspn.html">strcspn</a><br> <a href="strpbrk.html">strpbrk</a><br> <a href="strrchr.html">strrchr</a><br> <a href="strspn.html">strspn</a><br> <a href="strtok.html">strtok</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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