export function AccountNumberDirectiveFactory() {
  return new AccountNumberDirective();
}

class AccountNumberDirective implements angular.IDirective {
  require = 'ngModel';
  restrict = 'A';
  link = function (scope, elm, attrs, ctrl) {
    ctrl.$validators.accountNumber = function (modelValue, viewValue) {
      return AccountNumberRegex.test(viewValue);
    }
  }
}

const AccountNumberRegex = /^[0-9]{8}$/