You could do it with a mathematical operation based on the ASCII value...course that's not a regex.
It could be a regex, with the /e modifier.
This was actually my first thought and I attempted to implement it. However, if you're leaving Q and Z in there, as the posted code was, it's pretty tricky. That's what made me choose the tr/// which is probably a lot more efficient and is surely more straightforward anyway.
James
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