oh that's precious. maybe try (?i:\bu\W*s\W*a\b)
(?i:\bu\W*s\W*a\b\W*) if you want it to gobble up any ! or other non-alphanumeric nonsense on the end
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(?i:\bu\W*s\W*a\b\W*) if you want it to gobble up any ! or other non-alphanumeric nonsense on the end