So what did you make with the answers to your topics, you didn't even reply.
Don't just ask the same question again in a new thread.
Also try to be as clear as possible with your requests, just "Trim filename" is not enough.
But now you've supplied a screenshot. Looking at it, it seems you want to remove a certain amount of characters from the right side of the filename.
In Mp3tag there are often many ways to solve a problem.
Minna Minni (Instrumental) - We are The 1.mp3
So you want to remove the " - We are The 1" part from it.
Your approach: Remove the last 15 characters.
Solution for Mp3tag:
$left(%_filename%,$sub($len(%_filename%),15))
Maybe looks complicated, but once you have it, all you need to do is change the number to your needs.
Another approach: Just replace " - We are The 1"
Format string:
$replace(%_filename%, - We are The 1, )
Now that's easy.
Even this approach from your old topics works:
/t/10767/1
(it's just a different pattern)