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