Quote:
Originally Posted by chaley
To search for any isbn that isn't an ISBN-13 (isn't 13 characters long), put this in the search bar. It is a regular expression search that matches any 13-long ISBN, then negates the match. See the calibre manual for search expression syntax.
Code:
not identifiers:isbn:~^.{13}$
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I had to use
Code:
identifiers:"=isbn:" AND not identifiers:isbn:~^.{13}$
otherwise I got a bunch of books with no ISBN at all