Given a string like "Rich36!", it would produce
\w{4}\d{2}\! or \w+\d+\!.
And why wouldn't it produce one of these
/\w{6}!/
/\w+!/
/[A-Z][a-z]{3}\d\d!/
/Rich36!/
/......./
/\S+/
/.*/
I mean, the tightest or least general thing it could produce when
given a $string is just /\Q$string\E/ and the most general
thing would be /.*/s, and between those is a rather large
space of candidates.
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