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

Validating Credit Card Numbers

  • mario_sessini
     + 0 comments
    # Enter your code here. Read input from STDIN. Print output to STDOUT
import re
import itertools as it

N = int(input())
pattern = r'^[4-6][0-9]{3}([0-9]{12}|(-[0-9]{4}){3})$'
for _ in range(N):
    number = str(input())
    rawnumber = number.replace('-', '')
    consecutive = any(x>=4 for x in [len(list(i)) for k, i in it.groupby(rawnumber)])
    if re.match(pattern, number) and not consecutive:
        print("Valid")
    else:
        print("Invalid")