Flickr links in comments not linking fully

I've just noticed that in the "conversations" (specifically a comment from pownce) that flickr links are chopping off early. The auto-convert http://etc to a hyperlink is stopping at the @ sign in the link, so the link is missing @N00 from the end (in this particular case). I guess that there needs to be a few more non alpha-numeric characters added to the auto link preg_match.