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I know this is a very old post, Kovid, but I can't find the post that gave an example of how to do what I'm trying to do..
Having a similar issue where I have many old books from various sources over the years, I have found many of my books to have improper MOBI-ASIN strings in the identifier field. What I am trying to do is to find a way to search for and then bring up a list of JUST those books where the length of the string is greater than they 10 character length. I remember there was another post that explained how to do it, but I have been searching for it for the past 2 hours to no avail. If you see this post, could you please reply with how to accomplish this so I can save it for future reference. Thank you
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