For a long time I've been using specific filters to check to see if the relevant fields have NO leading or trailing spaces, ie. are trimmed.
For example, this checks the "Album" tag:
"$if($eql(%album%,$trim(%album%)),1,0)" IS "0"
This works, but I would need a whole series of filters to check every other ID3v2 tag for a series of MP3 files - info like Artist, Title, Genre, Composer, etc, etc.
What I want to know is: is there a way of checking ANY text string field for the same "trim" conditions (as the above example for "Album") but for ALL such fields, in one filter?