^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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I’m going to assume the answer is a magic square attempt that just isn’t very good
^.?$|^(..+?)\1+$
Matches strings of any character repeated a non-prime number of times
I’m going to assume the answer is a magic square attempt that just isn’t very good