Is it possible to do the equivalent of (aaa)(?:bbb|qqq)(ccc) in POSIX regular expressions?

Question

Perl

Well, that is, so that only aaa and ccc get into match for such an expression? In Perl regular expressions, this works fine, with POSIX it doesn’t work, although it seems that I even set the Extended flag. Do they even support something like this?

Answer 1

As far as I understood, the original string of the form
aaabbbcccor aaaqqqccc
Other should not be accepted.
It will also repeat the POSIX expression exactly like
(aaa)[b|q]{3}(ccc)
it, by the way, it can also be used in PERL expressions.