Remove Extra Track

Support
1

This incredibly simple expressions removes extra tracks of the format "/track."

Field: TRACK

Regular expression: /\d+

Replace matches with:

2

This can also do it:
Action type: Replace with regular expression
Field: TRACK
Regular expression: ^(\d+)/\d+$
Replace matches with: $1

[ ] case-sensitive comparison

Note the '^' and '$' anchor the search string to the beginning and the end.
The '(\d+)' captures whatevers inside.
And Replace matches with: $1 replaces whatever is inside that.