r': <a href="http://www.thisav.com/user/[0-9]+/([^"]+)">(?:[^<]+)</a>',
             webpage, 'uploader id', fatal=False)
         ext = determine_ext(video_url)
             r': <a href="http://www.thisav.com/user/[0-9]+/([^"]+)">(?:[^<]+)</a>',
             webpage, 'uploader id', fatal=False)
         ext = determine_ext(video_url)