from http://wiki.poshcode.org/Repository/Jaykul/PoshTweet_Module

url shortener regex

    [regex]$isgd   = "(?:https?://)?is.gd/([^?/ ]*)\b"  # No API to speak of
      [regex]$supr   = "(?:https?://)?su.pr/([^?/ ]*)\b"  # Stumble Upon has the StumblyUpon toolbar wrapped around it 
      [regex]$trim   = "(?:https?://)?tr.im/([^?/ ]*)\b"  # Seems to be dying
      [regex]$ffim   = "(?:https?://)?ff.im/([^?/ ]*)\b"  # note: ff.im is only FriendFeed entries
      [regex]$xrl    = "(?:https?://)?xrl.us/([^?/ ]*)\b"
      [regex]$bitly  = "(?:https?://)?bit.ly/([^?/ ]*)\b"
      [regex]$cligs  = "(?:https?://)?cli.gs/([^?/ ]*)\b"
      [regex]$twibz  = "(?:https?://)?([^/]+\.twi.bz/[^?/ ]*)\b"
      [regex]$snip   = "(?:https?://)?(?:snurl|snipr|snipurl)\.com/([^?/ ]*)\b"
      [regex]$twurl  = "(?:https?://)?twurl.nl/([^?/ ]*)\b"
      [regex]$tiny   = "(?:https?://)?tinyurl.com/([^?/ ]*)\b"
      [regex]$shrink = "(?:https?://)?shrinkster.com/([^?/ ]*)\b"