^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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Regex should generally be avoided wherever possible.
Yeah but it’s just so tempting… It validates so many inputs so easily…
And misses others you didn’t think about.
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.
