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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_last_not_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_last_not_of.html">find_last_not_of</a>  </div>  <div class="name-format">    find_last_not_of  </div>  <div class="syntax-name-format">    Syntax:  </div>  <pre class="syntax-box">  #include &lt;string&gt;  <strong>size_type</strong> find_last_not_of( const string&amp; str, <strong>size_type</strong> index = npos );  <strong>size_type</strong> find_last_not_of( const char* str, <strong>size_type</strong> index = npos);  <strong>size_type</strong> find_last_not_of( const char* str, <strong>size_type</strong> index, <strong>size_type</strong> num );  <strong>size_type</strong> find_last_not_of( char ch, <strong>size_type</strong> index = npos );</pre>  <p>The find_last_not_of() function either:</p>  <ul>    <li>returns the index of the last character within the current    string that does not match any character in <em>str</em>, doing a    reverse search from <em>index</em>, string::npos if nothing is    found,</li>    <li>does a reverse search in the current string, beginning at    <em>index</em>, for any character that does not match the first    <em>num</em> characters in <em>str</em>, returning the index in    the current string of the first character found that meets this    criteria, otherwise returning string::npos,</li>    <li>or returns the index of the last occurrence of a character    that does not match <em>ch</em> in the current string, doing a    reverse search from <em>index</em>, string::npos if nothing is    found.</li>  </ul>  <p>For example, the following code searches for the last  non-lower-case character in a mixed string of characters:</p>  <pre class="example-code">  string lower_case = &quot;abcdefghijklmnopqrstuvwxyz&quot;;  string str = &quot;abcdefgABCDEFGhijklmnop&quot;;  cout &lt;&lt; &quot;last non-lower-case letter in str at: &quot; &lt;&lt; str.find_last_not_of(lower_case) &lt;&lt; endl;              </pre>  <p>This code displays the following output:</p>  <pre class="example-code">  last non-lower-case letter in str at: 13               </pre>  <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_first_of.html">find_first_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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