^.?$|^(..+?)\1+$
<answer>
Matches strings of any character repeated a non-prime number of times
3 points
Looks like APL to me.
43 points
no
2 points
1 point
24 points
Syntactically valid Perl
10 points
*
Something like
!“A line with exactly 0 or 1 characters, or a line with a sequence of 1 or 3 or more characters, repeated at least twice”!<
3 points
It’s a line with a sequence of two or more characters repeated at least twice.
4 points
Only the part after the pipe character. The pipe character works as an “or” operator. RegalPotoo is right.
8 points
17 points
Just waiting for the oppertunity to hide this in prod.
3 points
It matches “yo momma”.