As I'm new here, I'm not an average user of TC, but I've seen how powerful it is. I've successfully managed to do a bulk rename process of some files, but now here's where I really don't know where to start off. I'm guessing the topic sounds awful in trying to explain what I need help with, but to put it into simplification:
I need to bulk select files that contain 11 chars and end with a '-', all from the right side of the filename. e.g.:
Really Cool Artist - Really Cool Song-cgh5etyctVE.mp3.mp3
Another Artist - Another Song-XXP-ew2q1FI.mp3
Some Artist - Some Song-_m5u4WXRl14.mp3
The only special chars in these sequences are '-' and '_', the rest are low and up case letters and numbers. I've tried combining some stuff that I've read from the manual and some other topics from this forum and I still can't manage to get that selection done.

I'd be more than happy for any advice for the latter. I'm currently segregating my music library and it's a mess having these garbage texts hanging out of every filename I have on there.