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Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand.
(lemmy.world)
^.?$|^(..+?)\1+$
Matches strings of any character repeated a non-prime number of times
It's a line with a sequence of two or more characters repeated at least twice.
Only the part after the pipe character. The pipe character works as an "or" operator. RegalPotoo is right.
They said—
Note—
It should be—
The regex in the post will match "abab". Their original description (line 2 of this comment) will not match "abab".
I agree, you're right about the part after the pipe and RegalPotoo's explanation was not entirely correct.