US ZIP Code in PY

Match US ZIP codes in 5-digit (12345) and ZIP+4 (12345-6789) formats.

Pattern

\b\d{5}(?:[\-\s]\d{4})?\b   (flags: g)

Python (re) code

import re

pattern = re.compile(r"\b\d{5}(?:[\-\s]\d{4})?\b")
input_text = "90210"
for m in pattern.finditer(input_text):
    print(m.group(0))

Stdlib `re` module — no third-party dependency. Works on Python 3.6+.

How the pattern works

Examples

Same pattern, other engines