Regex with PowerSearch - are there restrictions

Some regular expressions seem to be combinable with PowerSearch, others not. Is there a rule? For example, I can search for ^(A|B), but not for - ^(A|B).

Try -"^(A|B)" - should work, I think

It should work -"(A|B)", which is the same as -"[AB]".

Regular Expressions as search mode can be combined with PowerSearch.

For more information on PowerSearch, I would recommend you to check the official documentation.

The quotes did it!
Searching for Source: “^(A|B)” Target: - “^(A|B)”
with Regular Expressions turned on and PowerSearch is fine.
Thank you!!