export function FirstNameDirectiveFactory() {
  return new FirstNameDirective();
}

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

const FirstNameRegex = /^((?! and )(?!\&).)*$/