Ereg question

I am using ereg to validate the format of a date entry (mm/dd/yy), but if the year ends in a 0, it is being stripped and as such produces an error. So 1990 would be 199. The dob is being inputted by a form.... Here is my code: if (!ereg("^([0-9]{2})/([0-9]{2})/([0-9]{4})$", $formsave["dob"], $parts)) { $error["dob"] = "*"; $message["dob"] = "Invalid date format!"; $dob = " \"$parts[3]-$parts[2]-$parts[1]\""; } Thanks