title: Regex - Extract TwitterUsername from URL
body: <p>I'm looking for an universal regular expression which extracts the twitter username from an url.</p>
  <p><strong>Sample URLS</strong></p>
  <blockquote>
  <p><a href="http://www.twitter.com/#!/donttrythis" rel="noreferrer">http://www.twitter.com/#!/donttrythis</a></p>
  <p><a href="http://twitter.com/KimKardashian" rel="noreferrer">http://twitter.com/KimKardashian</a></p>
  <p><a href="http://www.twitter.com/#!/KourtneyKardash/following" rel="noreferrer">http://www.twitter.com/#!/KourtneyKardash/following</a></p>
  <p><a href="http://twitter.com/#!/jasonterry31/lists/memberships" rel="noreferrer">http://twitter.com/#!/jasonterry31/lists/memberships</a></p>
  </blockquote>