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    <a href="../index-2.html">cppreference.com</a> &gt; <a href=
    "index.html">Standard C String and Character</a> &gt; <a href=
    "strstr.html">strstr</a>
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  <div class="name-format">
    strstr
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  <div class="syntax-name-format">
    Syntax:
  </div>
  <pre class="syntax-box">
  #include &lt;cstring&gt;
  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="prettyprint">
  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="prettyprint">
  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>
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    <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>
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