^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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Yeah but it’s just so tempting… It validates so many inputs so easily…
deleted by creator
Yeah, I’ve found myself wasting quite a lot of time thinking of the ‘perfect regex’ for task X only to realise that I could have avoided doing so by simply taking a different approach.
