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^.?$|^(..+?)\1+$
Matches strings of any character repeated a non-prime number of times
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this post was submitted on 31 Oct 2024
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Oooof. I feel like trying to figure out what's wrong with some regex I didn't write is much harder than writing it myself personally.
I've never had to use it for important stuff tbh. But alongside a regex tester and a sample of the stuff I intend to use it on, I've had good results with an incremental approach where I tell the LLM what I want to change with the expression until I'm satisfied