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https://issues.apache.org/jira/browse/VALIDATOR-446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787711#comment-16787711
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Alex commented on VALIDATOR-446:
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Patch for functionality and test cases attached
> ISSN Validator extract ISSN from EAN-13
> ---------------------------------------
>
> Key: VALIDATOR-446
> URL: https://issues.apache.org/jira/browse/VALIDATOR-446
> Project: Commons Validator
> Issue Type: Wish
> Components: Routines
> Reporter: Alex
> Priority: Major
> Labels: validators
> Attachments: 0001-VALIDATOR-446-following-feedback.patch
>
>
> To extend the ISSNValidator to include an ISSN extraction from EAN-13.
> After verifying the submitted identifier is of type ISSN-EAN-13 ("977"
> prefix, valid check digit) the extraction would take the ISSN digits and
> recalculate the check digit and return the standard 8 digit ISSN.
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