Remove everything EXCEPT parentesis.

I listen to a lot of music in other languages and people tend to tag the artists:

"한글 (Korean)"

And I was wondering if there is an action to remove everything except the part that says "Korean" (So I want to remove"한글 (" and ")")

Thank you.

Create an action of the type "Replace with regular expression" for the respective field.
Enter as search string:
.((.))
Replace with
$1

You are a perfect human being. Thank you so much!!!

I hope this will bump.

How would I do the opposite? Keep only what isn't in parenthesis? I want to remove the "(한글)" again:

"Korean (한글)"

Several possibilities:
If the contents in the parenthesis is the last of the string, then everything behind the ( can be removed:
Action of the type "Replace with regular expression" for the field
Search string:_(.*$
(where the _ represents a leading space)
Replace string:
(leave empty)

If you simply want to remove the stuff in the parenthesis but leave everything else (in front or behind it:
Same action
Search string: _(.*)
Replace string:
(leave empty)

Wait I got it. I think. Hold on.

I did. Thanks a bunch again!!!