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Eugen Hanussek commented on VALIDATOR-482: ------------------------------------------ Hi [~paulspeijers], the format you use is not valid for the validator. Use one of the following formats to check: "978-0-19-982823-4", // https://issues.apache.org/jira/projects/VALIDATOR/issues/VALIDATOR-482 "978 0 19 982823 4", "9780199828234", !image-2021-08-19-19-01-20-512.png! regards EUGen > ISBN validator validates false for existing book > ------------------------------------------------ > > Key: VALIDATOR-482 > URL: https://issues.apache.org/jira/browse/VALIDATOR-482 > Project: Commons Validator > Issue Type: Bug > Reporter: Paul Speijers > Priority: Major > > For instance the following ISBN number exists but the validator returns false: > 978-0199828234 > https://www.worldcat.org/search?q=978-0199828234 -- This message was sent by Atlassian Jira (v8.3.4#803005)