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Last active January 15, 2019 12:43
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1.md

Validate string for PHP DateInterval. (P or PT, then any number with no leading zeros. At the end H for hour interval and W,D or M for weeks, days and months)

(P((0|[1-9][0-9]*))(W|D|M)|PT((0|[1-9][0-9]*))H)
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