cvcValidator function

String? cvcValidator(
  1. String? value
)

Implementation

String? cvcValidator(String? value) {
  if (value == null || value.isEmpty) {
    return 'CVC is Required';
  }
  final regex = RegExp(r'^[0-9]{3}$');
  if (!regex.hasMatch(value)) {
    return 'Invalid CVC';
  }
  return null;
}