isCreditCard static method
Implementation
static bool isCreditCard(String str) {
var sanitized = str.replaceAll(RegExp(r'\D+'), '');
if (!_creditCard.hasMatch(sanitized)) {
return false;
}
var sum = 0;
String digit;
var shouldDouble = false;
for (var i = sanitized.length - 1; i >= 0; i--) {
digit = sanitized.substring(i, (i + 1));
var tmpNum = int.parse(digit);
if (shouldDouble == true) {
tmpNum *= 2;
if (tmpNum >= 10) {
sum += ((tmpNum % 10) + 1);
} else {
sum += tmpNum;
}
} else {
sum += tmpNum;
}
shouldDouble = !shouldDouble;
}
return (sum % 10 == 0);
}