I’m trying to write a regex, where the same group of terms is looked for twice, but I want to avoid matching the same term twice. If a term is found in the first group, it should not be matched in the second group.

/(a|b).*?(a|b)/

This would match:

a a
a b
b a
b b

But I do not want to match a a and b b, only a b and b a. The method should work with any number of terms, (a|b) is just an example but it could be something like:

/(anna|beat|chris|dirk).*?(anna|beat|chris|dirk)/