Is there a reason to use (..+?) instead of (.+) ?

...either an empty string, a single character, or the same sequence of characters repeated more than once?

The pipe is throwing me off because usually I have to do parentheses for that to work...

It matches for non-primes and doesn't match for primes.

I'm I the only one who pronounces regex with a soft g? Hard g feels so clunky

All my homies hate regexs. That's actually the best use case I found for LLMs so far : I just tell it what I want it to match or not match, and it usually spits out a decent one