Keep Matter between parentheses, delete rest using GREP

Hi

I have received a text from a customer (screenshot attached).

I want to keep all the matter between the parentheses intact and delete rest of them.

Also, I want to delete the matter including parentheses marked in blue.

I have written following query:

Find: \(\x{0635}:\h?\d+\)

Change to: nothing

This deletes the parentheses with the matter which is marked in blue.

Then I wrote a second query which selects the text between parentheses (marked in red). How do I keep this intact and delete the rest of the matter?

I tried (*Skip)(*fail) method but I guess I am not very good at it.

This is the query I wrote to select the text marked in red which I want to keep.

Find: (?<=\()[^()]+(?=\))

I then tried another query to delete the matter in black in one go.

F: (\(.+?\))(?:.+)

C: $1

This query does not work as it should. Its leaving much of the black matter unchanged.

Any help would be appreciated.

Thanks.