Format credit card number

Question

How to format and validate a credit card number with spaces between each 4 digit while typing:

eg: 4464 6846 4354 3564

I have tried:

Answer 1

function cc_format(value) {
  var v = value.replace(/\s+/g, '').replace(/[^0-9]/gi, '')
  var matches = v.match(/\d{4,16}/g);
  var match = matches && matches[0] || ''
  var parts = []
  for (i=0, len=match.length; i 57) && (code > 31)) {
        return false;
    }

    return true;
}

Live demo of check digit and formatting of CC card number