^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
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…either an empty string, a single character, or the same sequence of characters repeated more than once?
^.?$|^(..+?)\1+$
Matches strings of any character repeated a non-prime number of times
…either an empty string, a single character, or the same sequence of characters repeated more than once?
