Convert "Tag - Tag"
... or ...
Action "Format value
Field: ARTIST
Formatstring: $regexp(%ARTIST%,'^(.+?)\s+[[({]?(?:ft\.?|feat\.?|featuring)\s+(?:[^][(){}]+)[])}]?(\s*.+)?$','$1$2',1)
See also ...
Two $if functions for the title
DD.20160130.1810.CET