Credit Card Number in PY
Match 16-digit credit card numbers with optional spaces or hyphens between groups of 4.
Try it in the PY tester →Pattern
regexPY
\b(?:\d{4}[\s\-]?){3}\d{4}\b (flags: g)Python (re) code
pyPython
import re
pattern = re.compile(r"\b(?:\d{4}[\s\-]?){3}\d{4}\b")
input_text = "4111 1111 1111 1111"
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
Three groups of 4 digits with optional space/hyphen separators, followed by a final 4-digit group. Word boundaries prevent partial matches.
Examples
Input
4111 1111 1111 1111Matches
4111 1111 1111 1111
Input
4111-1111-1111-1111Matches
4111-1111-1111-1111
Input
4111111111111111Matches
4111111111111111