creditCardValidator function

String? creditCardValidator(
  1. String? creditCard
)

Implementation

String? creditCardValidator(String? creditCard) {
  if (creditCard != null) {
    if (!_creditCardRegExp.hasMatch(creditCard)) {
      return 'Ingrese un numero de tarjeta valido';
    } else {
      return null;
    }
  }
  return null;
}