Expression for date (dd/mm/yyyy) field

[0-3][0-9][/](([0][0-9])|([1][0-2]))[/][0-9]{4}

Expression for valid email id

^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$