JAVASCRIPT

regex date checker

^(?:(?: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})$