Capture String between parenthesis with the use of regex

Question

I have one string which contains multiple parenthesis: Like this:

(This) (is a (test)) string, (Testing) should be (done (here)).

I have already tried some regex which I have found on the net. But as I am not so familiar with regex. Help is needed.

I have tried this:

$text = '(This) (is a (test)) string, (Testing) should be (done (here)).';
preg_match_all("/\([^\)]*\)/", $text, $matches);

You can have a look at this: https://regex101.com/r/8QCwOP/1

And I want result like this

1. This
2. is a (test)
3. Testing
4. done (here)