regex-validate-pin-code

Regex validate PIN code

ATM machines allow 4 or 6 digit PIN codes and PIN codes cannot contain anything but exactly 4 digits or exactly 6 digits.

If the function is passed a valid PIN string, return true, else return false.

eg:

Solution.validatePin("1234") === true
Solution.validatePin("12345") === false
Solution.validatePin("a234") === false