^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
1 point
*
\1 is group 1 which is inside (), so second part is repeated 2 or more times of 2 or more char.
Programmer Humor
!programmerhumor@lemmy.ml
Post funny things about programming here! (Or just rant about your favourite programming language.)
Rules:
- Posts must be relevant to programming, programmers, or computer science.
- No NSFW content.
- Jokes must be in good taste. No hate speech, bigotry, etc.
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