this post was submitted on 31 Oct 2024
328 points (97.7% liked)

Programmer Humor

32549 readers
601 users here now

Post funny things about programming here! (Or just rant about your favourite programming language.)

Rules:

founded 5 years ago
MODERATORS
 

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

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

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

you are viewing a single comment's thread
view the rest of the comments
[–] Feathercrown@lemmy.world 3 points 3 weeks ago (1 children)

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

[–] explore_broaden@midwest.social 5 points 3 weeks ago (1 children)

Yes, the first one matches only 2 more characters while the second matches 1 or more. Also the +? is a lazy quantifier so it will consume as little as possible.

[–] Feathercrown@lemmy.world 3 points 3 weeks ago (1 children)

Ah, didn't know +? was lazy, thanks

[–] Ephera@lemmy.ml 3 points 3 weeks ago (1 children)

I thought, the +? was going to be a syntax error. 🙃

[–] Feathercrown@lemmy.world 3 points 3 weeks ago

I was like, why specify "one or more" and then make it optional? Isn't that just .*?