CODE EXAMPLE FOR PYTHON

split credit card number python

import re
def cc(pat):
    # check for the pattern #### #### #### #### with each '#' being a digit
    m=re.match(r'(d{4})s(d{4})s(d{4})s(d{4})$', pat.strip())
    if not m:
        return False
    # join all the digits in the 4 groups matched, 
    # turn into a list of ints, 
    # sum and 
    # return True/False if divisible by 10: 
    return sum(int(c) for c in ''.join(m.groups()))%10==0

>>> cc('9384 3495 3297 0123')
False
>>> cc('9384 3495 3297 0121')
True