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  1. Prepare
  2. Python
  3. Regex and Parsing
  4. Validating Credit Card Numbers
  5. Discussions

Validating Credit Card Numbers

  • rmleon
     + 0 comments

    My regex-only implementation:

    from re import match
p = '^(?=[456])(?!.*(.)-?\\1-?\\1-?\\1)(\\d{4}-?){3}\\d{4}$'

for _ in range(int(input())):
    n = input()
    print('Valid' if match(p, n) else 'Invalid')