Ah, yes, you've helped me answer one of my questions that gave me trouble! That was, how to modify something that had been captured in a group? I realized I could capture the key (before the colon), but then didn't know how to just modify that part of it. I see your solution now, makes sense. Thank you!

Yes, certainly more than one way, but I got so excited when I started reading about (*SKIP) (and the like) and recursion (R)? that I thought perhaps there was a solution there.