OS X-based ID3 tagging programs that have comprehensive expression string options? I've tried Tag, TriTag, ID3 Editor, Jaikoz, and ID3X. It appears that none of them will allow me to create an ID3 tag pattern (%A - %N %T, etc.) from the filename while ignoring or omitting a certain part of it.

Media Rage comes closest, but its "Convert Filenames to Data" option doesn't seem to have an ignore character, and it seems to be a little quirky in the way it handles spaces.

Doug's "Filenames to Song Names" AppleScript isn't what I want, since that (obviously) only accounts for song names. He doesn't seem to have another one that fits the bill.

I'm at my wits' end. Am I missing anything (aside from mounting a Windows emulator to run something)?