Delete repeated genre's in the same exact field

[ohrenkino]

@Rycia

I have ONE genre field (not multiple,)

The dump that you kindly supplied shows data with a double backslash \\ which is in MP3tag usually the indicator that there are actually multiple fields of the same type.
Could you check the extended tags dialogue Alt-T whether how many fields of the type genre there are?
If you find several, then merge this field into one with an action of the type

Merge Duplicate Fields – Mp3tag Documentation

and use something unlike the double backslash as separator. A (comma or) semicolon would be nice.
And then have a look at this thread:

Merge duplicate words

You want to keep the first value. That's more complicated. [Edit:] Action: Format value Field: Genre Format string: $regexp($reverse($regexp($regexp($reverse($regexp($regexp(%Genre%,'^(\s+;*|\s*;+)+|(\s+;*|\s*;+)+$|((?<=;)\s+)|(\s+(?=;))',),'^|$',';')),'(;[^;]+)(?=(\1|;.*?\1))',),'^;+|;+$',)),'(?<=;)',' ') Replace Genre with any other tag and it will remove duplicates too. This action "fixes" first the multiple value string (remove multiple spaces after ; separator). It will add exac…