2HD
DIMENSION
CTU
SITV

Also, if the scene group is inside [] brackets will the below still work? As im unable to get it to.

example filename to be converted
law & order svu 11-01 unstable [hdtv 720p 2hd].mkv

rename syntax
{n} - {s00e00} - {t}{-fn.match(/(?<=[-])\w+$/)}

renamed to
Law & Order SVU ...