Thread: Search for ISBN-10s
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Old 02-09-2021, 04:52 AM   #16
ownedbycats
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I also figured out how to get ISBNs that use X for a check digit. It even accounts for case sensitivity.

Code:
identifiers:"=isbn:~^\d{9}(\d{1}|(X|x))$"
OR identifiers:"=isbn:~^\d{1}(-|\s)\d{3}(-|\s)\d{5}(-|\s)(\d{1}|(X|x))$"
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