Filter rule for "in any playlist" in smartplaylist

Feature description

Add ability in smartplaylists to create filter rule for songs that are in any playlist or in no playlist. This could be achieved by either:

  1. Extend the “In playlist” filter target with “is in any” and “is in none” filters
  2. Support wildcard/regex pattern for the “is” and “is not” filters’ values

Would be nice if it would work for the “In smart playlist” filter target as well.

Problem solved

I want to have a smartplaylist that contains all songs that have not been added to any other playlist yet.
This is technically already possible, if I create a smartplaylist and create a rule for each playlist, but for a lot of playlists this is really cumbersome to setup and maintain.

Brought benefits

Especially the wildcard/regex matching would be nice, so that one can easily filter for multiple playlists with just one rule, if playlists follow a custom naming scheme.
I had playlists folders with my previous setup so all my playlists are now named like “folder/name”. With pattern matching I would be able to create smartplaylists that combine playlists for each folder again.

Device type

All

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