I just wouldn't give up, but I think I got it! $regexp(%title%,'^(.+)\s[[({](.+?Mix|.+?Acoustic|.+?Edit|.+?Version|.+?Dub|.+?Remix)[])}]?$',$1 '['$2']')
$regexp(%title%,'^(.+)\s[[({](.+?Mix|.+?Acoustic|.+?Edit|.+?Version|.+?Dub|.+?Remix)[])}]?$',$1 '['$2']')