regex - regular expressions to check length with multiple options -

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i need validate date format, can either 11/11/11 or 11/22/2013, i.e. year block can in yy or yyyy , complete format either mm/dd/yy or mm/dd/yyyy

i've code

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

and i've tried

^(\d{1,2})\/(\d{1,2})\/(\d{2}{4})$ // doesn't works, nothing

and

^(\d{1,2})\/(\d{1,2})\/(\d{2|4})$ // , returns null every time

ps: i'm applying javascript/jquery

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

both \d{2}{4} , \d{2|4} not correct regex expression. have two digits , for digits separately , combine using or: (\d{2}|\d{4})


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