1 import { Injectable } from '@angular/core';
2 import { isNullOrUndefined, isString } from 'util';
5 export class NumbersLettersUnderscoreValidator {
6 static valid(control: any) {
7 let reg = /^[a-zA-Z0-9_]*$/;
9 if(isNullOrUndefined(control)) return null;
10 let val = isString(control) ? control : control.value;
12 return {'invalidNumberLettersUnderscore': true};
17 return {'invalidNumberLettersUnderscore': true};