Can you explain a little more about your data structures. It looks like you have hash references as the keys in your %$users hash - and that strikes me as a little scary (and it almost certainly doesn't do what you think it does).
The solution to your problem is probably to create a large regex from all off the individual regexes and use that instead.
"The first rule of Perl club is you do not talk about
-- Chip Salzenberg
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