Question on search syntax
I've created a set of tags to indicate where I obtained a particular eBook. These use the format of source:xxxx such as source:BaenFree, source:ProjectGutenberg, source:Mobileread, source:Fictionwise, etc.
I want to locate any books in the library that don't have a source tag. I can do this:
not tags:"=source:ArthurClassic" and not tags:"=source:Baen eBooks" and not tags:"=source:BaenFree" and not tags:"=source:Goodreads" and not tags:"=source:ManyBooks" and not tags:"=source:Mobileread"
But what I really want is a generic search. I tried
not tags:"=source:*"
but that didn't work. Obviously I don't know how to indicate a match for any and all characters. (And I have a suspicion that this has something to do with regular expressions which I simply don't seem to be able to understand.)
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