Programmer Humor

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submitted 2 weeks ago* (last edited 2 weeks ago) by [email protected] to c/[email protected]

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^.?$|^(..+?)\1+$

Matches strings of any character repeated a non-prime number of times

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[–] [email protected] 23 points 2 weeks ago (6 children)

Syntactically valid Perl

[–] [email protected] 8 points 2 weeks ago* (last edited 2 weeks ago) (5 children)

Something like

!"A line with exactly 0 or 1 characters, or a line with a sequence of 1 or 3 or more characters, repeated at least twice"!<

[–] [email protected] 8 points 2 weeks ago

You're misreading the ..+? part. That means 2 or more characters, non greedy.

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