Thank you! I had typed a reply that I'd found the vf / ac expressions but I guess I didn't click submit. I think those should work better than the way I handle it now, to be honest.

I've been using theRenamer for years but I've decided to move to FileBot because it seems to be a little (or maybe a lot!?, still learning:)) more robust and it's actively supported! theRenamer has worked fairly well but it's inefficient, clunky and doesn't appear to be supported any longer. I think ...