this post was submitted on 31 Oct 2024
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Programmer Humor

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^.?$|^(..+?)\1+$

Matches strings of any character repeated a non-prime number of times

https://www.youtube.com/watch?v=5vbk0TwkokM

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[–] [email protected] 2 points 2 months ago (1 children)

Empty input Or input of exactly 1 character Or input of at least 2 characters, followed by at least 1 something (idk what \1 matches)

Did I get it (almost)?

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago) (1 children)

\1 is group 1 which is inside (), so second part is repeated 2 or more times of 2 or more char.

[–] [email protected] 1 points 2 months ago

Interesting.

So that means match any string that is made entirely of a single repeating sequence, where repititon is possible.

[–] [email protected] 2 points 2 months ago

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

[–] [email protected] 2 points 2 months ago* (last edited 2 months ago)

I could be wrong but I think the (..+?) portion will either remove a dud or replenish the allowance.

[–] [email protected] 2 points 2 months ago

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

[–] [email protected] 2 points 2 months ago

Looks like APL to me.

[–] [email protected] 2 points 2 months ago

It matches “yo momma”.

[–] [email protected] 1 points 1 month ago* (last edited 1 month ago)

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

[–] [email protected] -2 points 2 months ago (3 children)

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

[–] [email protected] 2 points 2 months ago

That sounds…

Easier to get almost right than actually learning the subject.

Much, much harder to get completely right than actually learning the subject.

So yes, basically the archetypal use case for LLMs.

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