Filter files that have different filenames than expression

Is it possible to filter files to show only those that don't match a given string? I've tried this filter but it doesn't work:
NOT "%_filename%" IS "$num(%track%,2). %title%"

I want to find all files that have wrong filename without using 'Tag - Filename' function at the whole library, to avoid changing date modified.

You would have to use an expression in front of the operator:
"$if($eql(%_filename%,'$num(%track%,2). %title%'),1,0)" IS "1"

Thank you very much, I forgot about that way.
It works but with one change - removed single apostrophes:
"$if($eql(%_filename%,$num(%track%,2). %title%),1,0)" IS "0"