Twitter: rewrite URLs and replies as links

gistfile1.aw

<?php
  // Convert URL's with protocol prefix
  $text = ereg_replace("[a-zA-Z]+://([-]*[.]?[a-zA-Z0-9_/-?&%])*", "<a href=\"\\0\">\\0</a>", $text);

  //Convert URL with just www.
  $text = ereg_replace("(^| |\n)(www([-]*[.]?[a-zA-Z0-9_/-?&%])*)", "\\1<a href=\"http://\\2\">\\2</a>", $text);

  //Convert @ replies
  $text = ereg_replace("(^| |\n)(\@([-]*[.]?[a-zA-Z0-9_/-?&%])*)", "\\1<a href=\"http://www.twitter.com/\\2\">\\2</a>", $text);
  $text = str_replace("/@", "/", $text);

  return $text;
?>