Move "&" or "," from Artist to Title

Hello,
I read your discussions on the post Move "Featuring" from Artist to Title

But how do you do that when you have :

%artist% : J Álvarez & Jowell & Randy
%title% : Enamórate

And we want :

%artist%: J Álvarez & Jowell & Randy
%title%: Enamórate (& Jowell & Randy)

Thus

%artist%: J Álvarez , Jowell & Randy
%title% : Enamórate

and that we want:

%artist%: J Álvarez
%title%: Enamórate (& Jowell & Randy)

For

try an action of the type "Guess value" (import tag fields)
Source: $regexp(%artist%==%title%,(.*?) & (.*)==(.*),$1==$3 \(& $2))
Target: %artist%==%title%

For

You could do something similar with the comma instead of the & - but what "Earth, Wind & Fire", "Bell, Book & Candle", "KC & The Sunshine Band", "Kid Creole & THe Coconuts" and many more?

Thank you for the "&".
and yes I will drop the "comma" because for some artsite it will not be good.

Thank you very much