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Im afraid that sort of question has been asked and answered many times in this thread. There is no “standard” for what ISBN position is in a book, it is at the whim of the publishers. Add in ISBNs for “related” books that they throw in there and there is no rule that can ever be defined to provide a guaranteed particular ISBN. Reverse will give terrible results for as many cases as it will give good ones. Just like looking for particular words being before are just as likely to be after or not present at all.
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