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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>find_first_of</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> &gt; <a href=    "index.html">C++ Strings</a> &gt; <a href=    "find_first_of.html">find_first_of</a>  </div>  <div class="name-format">    find_first_of  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string&gt;  <strong>size_type</strong> find_first_of( const string &amp;str, <strong>size_type</strong> index = 0 );  <strong>size_type</strong> find_first_of( const char* str, <strong>size_type</strong> index = 0 );  <strong>size_type</strong> find_first_of( const char* str, <strong>size_type</strong> index, <strong>size_type</strong> num );  <strong>size_type</strong> find_first_of( char ch, <strong>size_type</strong> index = 0 );</pre>  <p>The find_first_of() function either:</p>  <ul>    <li>returns the index of the first character within the current    string that matches any character in <em>str</em>, beginning the    search at <em>index</em>, string::npos if nothing is found,</li>    <li>searches the current string, beginning at <em>index</em>, for    any of the first <em>num</em> characters in <em>str</em>,    returning the index in the current string of the first character    found, or string::npos if no characters match,</li>    <li>or returns the index of the first occurrence of <em>ch</em> in    the current string, starting the search at <em>index</em>,    string::npos if nothing is found.</li>  </ul>  <div class="related-name-format">    Related topics:  </div>  <div class="related-content">    <a href="find.html">find</a><br>    <a href="find_first_not_of.html">find_first_not_of</a><br>    <a href="find_last_not_of.html">find_last_not_of</a><br>    <a href="find_last_of.html">find_last_of</a><br>    <a href="rfind.html">rfind</a>  </div>  </div>  </td>    </tr>  </table></body></html>

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