BTVG

You can try my "group" resolver

if in the builtin "group", group-jshdfjhvsdf.ext or sdkjhdvfsdsf-group.ext it will get it ;)
plus some more... "filters"

{
def dn = call{(file.parentFile.name).match(/(?:\-\w+(?=\[\w+\])|\-\w+$)/)};
def nn = call{fn.match(/(?:(?=(?:19|20)+[0-9]+)\w.+$)/)};
def g ...

Missing P2P groups:

Ms89
HDVN
Smithers
DHARMA
MULTiPLEX
HvO
4DDL
DnO