Remove text from artist and files

hello my friends. I got a question

q1. How do I remove all artist after the first artist.
for example the artist is listed as : Exile, Blu, Exile, Miguel

I want it to only show: Exile and nothing else

Try an action of the type "Replace witht regular expression" for ARTIST
Search patter: (.*?),(.*)
Replace with: $1

Beware of artists like
Earth, Wind & Fire
Emerson, Lake & Palmer
10,000 Maniacs
Blood, Sweat & Tears
Brooklyn, Bronx & Queens Band
Crosby, Stills, Nash & Young
Ellis, Beggs & Howard
I Will, I Swear
Kitty, Daisy & Lewis
... and many more