Every once in a while I want to replace all instances of values like:

<BarFoo>

with

<barfoo>

i.e. do a regular expression replace of all things inside angle brackets with its lowercase equivalent.

Anyone got a nice snippet of Lisp that does this? It's safe to assume that we're dealing with just ASCII values. Bonus points for anything that is generic enough to take a full regular expression, and doesn't just handle the angle brackets example. Even more bonus points to an answer which just uses M-x query-replace-regexp.

Thanks,

Dom

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