postal-code-us.md

U.S. postal code (ZIP code)

A United States postal code, or ZIP code, is five arabic numbers optionally followed by a hyphen and four numbers.

captures:
  1: zip_plus4 - The complete ZIP+4 postal code
  2: zip       - The five-digit ZIP code
  3: plus4     - The last four digits

implementations:
  named_capture:
    - |-
      (?<zip_plus4>           # The complete ZIP+4 postal code
        (?<zip>[0-9]{5})      # The five-digit ZIP code
        ((?:-)                # The hyphen (don't capture)...
          (?<plus4>[0-9]{4})  # and the last four digits
        )?                    # ...are optional
      )

    - (?<zip_plus4>(?<zip>[0-9]{5})((?:-)(?<plus4>[0-9]{4}))?)