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<?php $pattern="/^20[12345][34567890]-[01][0-9]-[0123][0-9]$/"; if(preg_match($pattern,"2013-09-10")) { echo "in"; } ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
in