^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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knowing Matt Parker it only matches prime numbers or multiples of e or something.
looks at <ansewer>
Yeah see?
Matt Parker will destroy us all! (https://youtu.be/GyNbLtiAgj4?si=r77Ef7wm9EZ83T6J)
