I have tried two different ones. This one:
Season ([0-9]+) - Episode ([0-9]+)
Season ([0-9]+) - Episode ([0-9]+)[^\\/]*
The second one is what I have in XBMC. All my TV shows are on one drive in the following format:
E:\Ghost Whisperer\Season 1\Ghost Whisperer - Season 1 - Episode 01.avi
I know it is dumb but that is what I started with and I don't want to change now.
It did work in version 2.xxx (whatever one worked last).