Thread: ISBN-x to ISBN-13 conversion / sort
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Old 05-29-2023, 03:54 PM   #8
chaley
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Quote:
Originally Posted by ownedbycats View Post
I had to use
Code:
identifiers:"=isbn:" AND not identifiers:isbn:~^.{13}$
otherwise I got a bunch of books with no ISBN at all
The OP asked for a search that returned anything that wasn't an ISBN-13, which includes empty ISBNs.
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