You are right, grep will not do captures in such a situation. I might not have been clear, but I only mentionned is as an additional useful tool in similar synctactic context, for filtering purpose.
Having said that you can do something akin to captures in a grep, although it is not very clean. Consider this:
DB<1> @a = qw (foobar barfoo foobaz, bar, foobor);
DB<2> @c = grep {s/fo(ob.).+/$1/} @a;
DB<3> x @c
0 'oba'
1 'oba'
2 'obo'
Not clean, I would not really recommend it, but not impossible.
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