Thank you for the reply. I went to:
Actions-> Replace with Regular Expression->Field: TITLE -> Regular Expression: $regexp(%TITLE%,'^(.+?)\s+[[({]?(?:ft\.?|feat\.?|featuring)\s+(?:[^][(){}]+)[])}]?(\s+.+)?$','$1$2',1)
I run it but get no change. What I am doing wrong?
The $regexp() scripting function can be used with the converer "Tag - Tag" or an action "Format value" — both for field TITLE.
If you want to use an action "Replace with Regular Expression" you need to extract the expression (2nd parameter) and the replacement (3rd parameter) from the $regexp() call and put in in the appropriate configuration fields of the action.