Web Forms :: Comparing Two Regular Expressions Of Date?

I applied regular expression validator on date of birth and Missing date for a missing person.  the missing date should be greater than the date of birth . I applied compare vallidator but it is not working properly. it comparing day of date of birth with day of missing date, both months and years...

if i give...

date of birth:  2/2/1980

Missing date: 1/2/1981

it is giving the error message...

I applied this regular expression:

^((0?[13578]|10|12)(-|/)(([1-9])|(0[1-9])|([12])([0-9]?)|(3[01]?))(-|/)((19)([2-9])(d{1})|(20)([01])(d{1})|([8901])(d{1}))|(0?[2469]|11)(-|/)(([1-9])|(0[1-9])|([12])([0-9]?)|(3[0]?))(-|/)((19)([2-9])(d{1})|(20)([01])(d{1})|([8901])(d{1})))$