title: PHP preg_match UUID v4
body: <p>I've got a string that contains <a href="http://www.php.net/manual/en/function.uniqid.php#94959" rel="noreferrer">UUID v4</a>  </p>
  
  <pre><code>$uuid = 'http://domain.com/images/123/b85066fc-248f-4ea9-b13d-0858dbf4efc1_small.jpg';
  </code></pre>
  
  <p>How would i get the <code>b85066fc-248f-4ea9-b13d-0858dbf4efc1</code> value from the above using <code>preg_match()</code>?<br>
  More info on UUID v4 can be be found <a href="http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_.28random.29" rel="noreferrer">here</a></p>