^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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The pipe is throwing me off because usually I have to do parentheses for that to work…
^.?$|^(..+?)\1+$
Matches strings of any character repeated a non-prime number of times
The pipe is throwing me off because usually I have to do parentheses for that to work…
