title: REGEX - match words that contain letters repeating next to each other
body: <p>im looking for a regex that matches words that <strong>repeat a letter(s) more than once and that are next to each other</strong>. </p>
  
  <p>Here's an example:</p>
  
  <pre><code>This is an exxxmaple oooonnnnllllyyyyy!
  </code></pre>
  
  <p>By far I havent found anything that can exactly match:</p>
  
  <pre><code>exxxmaple and oooonnnnllllyyyyy
  </code></pre>
  
  <p>I need to find it and place them in an array, like this:</p>
  
  <pre><code>preg_match_all('/\b(???)\b/', $str, $arr) );
  </code></pre>
  
  <p>Can somebody explain what regexp i have to use?</p>