C# Regular Expression to validate a date?

Question

I am trying to validate a date entered into a text box. There is an input mask on the textbox which forces input of xx/xx/xxxx. I am trying to use a regular expression valid

Answer 1

([0][1-9]|[1][0-9|][2][0-9]|[3][0-1])\/([0][1-9]|[1][0-2])\/[1-2][0-9][0-9][0-9]

for dd/mm/yyyy (year can be from 1000 to 2999)

or

(([0][1-9]|[2][0-9]|[3][0-1]|[1-9]|[1][0-9])/([0][1-9]|[1][0-2]|[1-9])/([1-2][0-9][0-9][0-9]|[0-9][0-9]))

which includes d/m/yy (e.g. 1/12/82)