帮忙啊大虾，求日期正则表达式

Question

^(?ni:(?=\d)((?'year'((1[6-9])|([2-9]\d))\d\d)(?'sep'[/.-])(
?'month'0?[1-9]|1[012])\2(?'day'((?<!(\2((0?[2469])|11)\2))3
1)|(?<!\2(0?2)\2)(29|30)|((?<=((1[6-9]|[2-9]\d)(0[48]|[2468]
[048]|[13579][26])|(16|[2468][048]|[3579][26])00)\2\3\2)29)|
((0?[1-9])|(1\d)|(2[0-8])))(?:(?=\x20\d)\x20|$))?((?<time>((
0?[1-9]|1[012])(:[0-5]\d){0,2}(\x20[AP]M))|([01]\d|2[0-3])(:
[0-5]\d){1,2}))?)$

Answer 1

http://www.regexlib.com/REDetails.aspx?regexp_id=581

Answer 2

/^(\d{1,4})(-|\/)(\d{1,2})\2(\d{1,2})$/

Answer 3

^(?:(?:(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(\/|-)(?:0?2\1(?:29))$)|(?:(?:1[6-9]|[2-9]\d)?\d{2})(\/|-)(?:(?:(?:0?[13578]|1[02])\2(?:31))|(?:(?:0?[1,3-9]|1[0-2])\2(29|30))|(?:(?:0?[1-9])|(?:1[0-2]))\2(?:0?[1-9]|1\d|2[0-8]))$