$set(_feat_title,$rsearch(%artist%,\\s+\\\(?\(f\(ea\)?t\\.[^\)]*\)))
$set(_feat_title,$rreplace(%_feat_title%,^f\(ea\)?t\\.,ft.))
$set(artist,$rreplace(%artist%,\\s+\\\(?f\(ea\)?t\\.[^\)]*\\\)?,))
$set(albumartist,$rreplace(%albumartist%,\\s+\\\(?f\(ea\)?t\\.[^\)]*\\\)?,))
$if($and(%_feat_title%,$not($in($replace($lower(%title%),feat.,ft.),$lower(%_feat_title%)))),$set(title,%title% \(%_feat_title%\)))
$unset(_feat_title)