validators

email

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

/**
 * All file sizes specified in bytes.
 */
export function emailValidator(): ValidatorFn {
  return (control: AbstractControl): {[key: string]: any} => {
    const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    const passed = re.test(control.value);

    return passed ? null : { invalidEmail: true };
  };
}

required.v.ts

import { ValidatorFn, AbstractControl } from '@angular/forms';
import { isNumber, isNull, isEmpty } from 'lodash';

export function requiredValidator(): ValidatorFn {
  return (control: AbstractControl): {[key: string]: any} => {
    if (isNumber(control.value)) {
      return null;
    }
    if (isNull(control.value) || isEmpty(control.value)) {
      return {required: true};
    }

    return null;
  };
}