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Oh boy what a beautiful regex. I'm sure it does something logical and easy to understand. (lemmy.world)

submitted 5 days ago* (last edited 5 days ago) by [email protected] to c/[email protected]

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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] 18 points 4 days ago* (last edited 4 days ago) (2 children)

Whatever you do, don't get in a time machine back to 1998 and become a Unix sysadmin.

(Though we didn't have CL-PPCRE then. It's really the best thing that ever happened to regex.)

[–] [email protected] 2 points 4 days ago

I was a sysadmin with some Linux usage in 1998, does that count?

[–] [email protected] 4 points 4 days ago

I have to admit that using CL-PPCRE does not really help me understanding the regexp any better. But this may be because I deal with complex regexps for decades now, and I just read them.