How to filter files with more than "basic" set of tags?

[DetlevD]

@vertigo phreeze

basically, i only use artist, albumartist, album, track, title, composer, year, genre and embedded cover art. how would i go about creating a filter to show me any files than contain any tags besides the ones listed above? i don't know if this matters or not, but it would be ok files don't have all of those, like cover art or composer, i just want files that have anything other than those.

Here is a mp3tag Filter expression line that might work ... except for the %_covers% tag-field.

NOT ("$regexp($regexp($list('~~','~~','=='),'~~(.+?)~~.+?==','$1~~'),'((ARTIST|ALBUMARTIST|ALBUM|TRACK|TITLE|COMPOSER|YEAR|GENRE)~~)',)" IS "")

DD.20120130.1959.CET