IF EXIST SPECHIAL CHARACTER DO...

hi
my 3 files is:
title---------------------------------------artist
song1 (live)----------------------artist1
song2-----------------------------artist2
song3 (ft abc)----------artist3

i want add "abc" to artist 3 if "ft" exist before it and no add "live" because no exist "ft" before it
then remove "(ft abc)

my new files is:
title---------------------------------------artist
song1 (live)----------------------artist1
song2-----------------------------artist2
song3----------artist3 Ft abc

please give me code to do all changes
thanks

This thread
/t/11096/1
features a lot of examples how to move the "feat" about.
Do not fiddle with the filenames, fill the tags first, then create new filenames.