Add links to a tweet message

gistfile1.aw

<?php
$ret = preg_replace("#(^|[\n ])@([A-Za-z0-9_]+)#ise", "'\\1<a target=\"_blank\" href=\"http://www.twitter.com/\\2\" >@\\2</a>'", $text);
$ret = preg_replace("#(^|[\n ])\#([A-Za-z0-9_]+)#ise", "'\\1<a target=\"_blank\" href=\"http://twitter.com/#!/search/%23\\2\" >#\\2</a>'", $ret);
$ret = preg_replace("#(^|[\n ])([\w]+?://[\w]+[^ \"\n\r\t<]*)#ise", "'\\1<a target=\"_blank\" href=\"\\2\" >\\2</a>'", $ret);
$text = preg_replace("#(^|[\n ])((www|ftp)\.[^ \"\t\n\r<]*)#ise", "'\\1<a target=\"_blank\" href=\"http://\\2\" >\\2</a>'", $ret);
?>