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

Validating Credit Card Numbers

  • zeusonline1998
     + 0 comments

    I used groupby from itertools since I wasnt able to form regex for second pattern here

    import re
from itertools import groupby

pat = r'^[456]\d{3}(-?\d{4}){3}$'

for _ in range(int(input())):
    flag = True    
    inp = input()
    if re.fullmatch(pat, inp):
        inp = inp.replace('-','')
        grp = groupby(inp)
        for k, g in grp:
            if len(list(g))>=4:
                flag = False
                break
    else:
        flag=False        
    if flag:
        print("Valid")
    else:
        print("Invalid")