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<a name="strcasestr_002d_002d_002dcase_002dinsensitive-character-string-search"></a>
<h3 class="section">5.19 <code>strcasestr</code>&mdash;case-insensitive character string search</h3>
<a name="index-strcasestr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;string.h&gt;
char *strcasestr(const char *<var>s</var>, const char *<var>find</var>);

</pre></div>
<p><strong>Description</strong><br>
<code>strcasestr</code> searchs the string <var>s</var> for
the first occurrence of the sequence <var>find</var>.  <code>strcasestr</code>
is identical to <code>strstr</code> except the search is
case-insensitive.
</p>
<br>
<p><strong>Returns</strong><br>
</p>
<p>A pointer to the first case-insensitive occurrence of the sequence
<var>find</var> or <code>NULL</code> if no match was found.
</p>
<br>
<p><strong>Portability</strong><br>
<code>strcasestr</code> is in the Berkeley Software Distribution.
</p>
<p><code>strcasestr</code> requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.
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