One of the many ways would be to write an action group where set which word should be replaced by which other word.
Finally you add the action for the closing parenthesis.
Or see here:
To avoid side effects ... set ...
Filterstring: ARTIST HAS " Feat. "
That means I could select all of my tracks (with or without featurings) and only apply modification to featurings tracks ?
How do I add a filterstring ? That's within the same Action Group ?
A filter string is not added to an action group.
Instead, it is entered into the Filter window, before the action is performed.
Then, only the files that match the filter will be in the file list.
To see the Filter window go to "View > Filter" on the menu bar.
The number, length and size of the matching files are shown in the bottom right corner of the file list.