I don’t program in any of those languages. I do, however write a mean regular expression, which the people at work who do use those languages seem to find quite useful.
It can't be meaner than what my former pal and mentor wrote and could not understand immediately after he wrote it, but when he did (understand it) he could not explain it understandably to anyone, and which regular expression despite or perhaps because of it all worked!
Do you're the person I need to hunt down and kill! [j/k]
But on a more serious note, I absolute loathe regular expressions -- as most of my career has been maintenance/additional-development regex always becomes a pain in the ass.
Example:
The original requirement was validating the phone-number was 7 digits, now it has to be 7-digits w/ the '-' optional in NNN-NNNN form... oh, now we need it to recognize area-codes (NNN)-NNN-NNNN, oh now it also needs to accept NNN-NNN-NNNN... oh, now it needs to understand country codes... oh now it needs to accept the proper format based on the country-code.
*Sigh*