Hi! I have track, for example: "Roger Sanchez - My Way (Original Mix) Stealth Records"
I import "Stealth Records" to publisher...
open mp3tag...
choose guess values,
source format: %_filename%
guessing pattern: %_filename%) %publisher%
and "Stealth Records" copy to %publisher%.
How to remove "Stealth Records" from filename???
Thanks.
Hmm, it seems like you have found a bug in Mp3tag v2.75, ...
because Mp3tag treats the variable %_filename% as a writeable tag-field ...
within the action "Guess values".
After running your proposed exploit ...
Action "Guess values"
source format: %_filename%
guessing pattern: %_filename%) %publisher%
... the variable %_filename% has this content ...
$left(%_filename%,$len(%_filename%)) ==> 'Roger Sanchez - My Way (Original Mix'
The original filename has not been changed.
DD.20160315.1348.CET
My version is 2.57. 
Ok, how to move text after ")" to publisher and remove this from filename?
Convert>Filename-Filename
Source: %1) %2
Target: %1)