Copying last n characters of filename to tag.

Edit: I just realised i could do it using %dummy%

as in %dummy-%dummy%-%year%


I have 100's of podcast mp3s named using this weird convention and all there tags are blank.

Podcast Name - Brief Episode Rundown - 01 Jan 16.mp3

I wanted to add the last part (01 Jan 16) to 1 tag and also the (Brief Episode Rundown) to a 2nd tag.

but im scratching my head how ill do it.