Email Validator what works for NG2 and Ionic 2 apps.

email-validator.ts

import {FormControl} from '@angular/forms';

export class EmailValidator {

    static isValid(control: FormControl){

      var 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,}))$/.test(control.value);

      if (re){
        return null;
      }

      return {"invalidEmail": true};
    }

}

You might want to use this validator on an optional field which at the moment it doesn't support. I changed the snippet to this to let Validators.required handle that:

import { FormControl } from '@angular/forms';

export class EmailValidator {

    static isValid(control: FormControl): any {
        let 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,}))$/;

        // skip validation if empty (Validators.required should handle this)
        if(!control.value) {
            return null;
        }
        
        if(!re.test(control.value)) {
            return {
                "invalidEmail": true
            };
        }

        return null;
    }
}

how you use in a form?

how to check with ngIf in html file?
and i'm using ionic2..