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Next: <a href="strcat.html#strcat" accesskey="n" rel="next">strcat</a>, Previous: <a href="strcasecmp.html#strcasecmp" accesskey="p" rel="prev">strcasecmp</a>, Up: <a href="Strings.html#Strings" accesskey="u" rel="up">Strings</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="strcasestr_002d_002d_002dcase_002dinsensitive-character-string-search"></a>
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<h3 class="section">5.19 <code>strcasestr</code>—case-insensitive character string search</h3>
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<a name="index-strcasestr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <string.h>
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char *strcasestr(const char *<var>s</var>, const char *<var>find</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>strcasestr</code> searchs the string <var>s</var> for
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the first occurrence of the sequence <var>find</var>. <code>strcasestr</code>
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is identical to <code>strstr</code> except the search is
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case-insensitive.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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</p>
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<p>A pointer to the first case-insensitive occurrence of the sequence
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<var>find</var> or <code>NULL</code> if no match was found.
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<br>
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<p><strong>Portability</strong><br>
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<code>strcasestr</code> is in the Berkeley Software Distribution.
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</p>
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<p><code>strcasestr</code> requires no supporting OS subroutines. It uses
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tolower() from elsewhere in this library.
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