import { 
  AbstractControl, 
  ValidationErrors, 
  ValidatorFn 
} from "@angular/forms";

export function forbiddenNameValidator(forbiddenName: RegExp): ValidatorFn {
  return (control: AbstractControl): ValidationErrors | null => {
    const forbidden = forbiddenName.test(control.value);
    return forbidden ? { 'forbiddenName': { value: control.value } } : null;
  }
}