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ISO-8601 Duration Regex
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| var iso8601durationregex = /^P([0-9]+(?:[,\.][0-9]+)?Y)?([0-9]+(?:[,\.][0-9]+)?M)?([0-9]+(?:[,\.][0-9]+)?D)?(?:T([0-9]+(?:[,\.][0-9]+)?H)?([0-9]+(?:[,\.][0-9]+)?M)?([0-9]+(?:[,\.][0-9]+)?S)?)?$/ |
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The week designator is missing, so a valid ISO 8601 Duration like "P2W" (=2 Weeks") does not match.
I ended up using
/^(-?)P(?=\d|T\d)(?:(\d+)Y)?(?:(\d+)M)?(?:(\d+)([DW]))?(?:T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+(?:\.\d+)?)S)?)?$/instead.