<?php var_dump(preg_match('%\A(?:(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01]))\Z%', "asdf")); var_dump(preg_match('%\A(?:(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01]))\Z%', "2013-01-01"));
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