JAVASCRIPT

date regex

^(0?[1-9]|[12][0-9]|3[01])[/-](0?[1-9]|1[012])[/-]d{4}$

date regex format

(^(((0[1-9]|1[0-9]|2[0-8])[/](0[1-9]|1[012]))|((29|30|31)[/](0[13578]|1[02]))|((29|30)[/](0[4,6,9]|11)))[/](19|[2-9][0-9])dd$)|(^29[/]02[/](19|[2-9][0-9])(00|04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96)$)

regex date

^(?:(?:31(/|-|.)(?:0?[13578]|1[02]|(?:Jan|Mar|May|Jul|Aug|Oct|Dec)))1|(?:(?:29|30)(/|-|.)(?:0?[1,3-9]|1[0-2]|(?:Jan|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))2))(?:(?:1[6-9]|[2-9]d)?d{2})$|^(?:29(/|-|.)(?:0?2|(?:Feb))3(?:(?:(?:1[6-9]|[2-9]d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1d|2[0-8])(/|-|.)(?:(?:0?[1-9]|(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep))|(?:1[0-2]|(?:Oct|Nov|Dec)))4(?:(?:1[6-9]|[2-9]d)?d{2})$