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Specifically, I’m using the Linux command:
$ find . -regextype posix-extended -regex '<some regex>' ...
I just want to make sure the POSIX type I’m using is the type Perl uses, since that is by far the one I am most familiar with.
Perl’s regexes are more like the Posix extended ones. Basic posix regular expressions use
(and{to match the actual characters, and\(and\{as special characters, but the Posix extended ones use(and{for the same meaning as in Perl and\(or\{to match the actual characters, the same as Perl. So posix-extended is what you want.