Remove repetition from tag

[ohrenkino]

I found a thread on repeated artists:

Double Artist Removal

Not that great at mp3 tag. I have a lot of files that are formated as such %artist%/%artist% and would like them to be only %artist% E.g. Chicago/Chicago changed to Chicago How would i do this? Thanks

And this regular expression
$regexp($replace(In My Arms [Crumbling Down Mix] Crumbling Down Mix,[,,],),'(.+?)/\1','$1')
results in
"In My Arms Crumbling Down Mix"
which has actrually 2 blanks in front of the "crumbling". So it should be easy to replace those with a [ if required. The ] can be added in the regular expression already as text constant.