RegExp判斷五碼數字(郵遞區號5碼)

^\d{5}$

demo:
https://regex101.com/r/o2TPJ0/1


NNN|NNNNN
^[0-9]{3,3}|[0-9]{5,5}$
https://msdn.microsoft.com/zh-tw/library/partnercenter/dn974938.aspx