如何在Angular2中验证邮箱？基于FormGroup等组件的表单验证实现

最近我在开发Angular 2应用的登录组件，用FormGroup、FormBuilder和Validators类来做表单验证。下面是我为邮箱和密码字段定义必填校验规则的代码片段：

export class LoginComponent implements OnInit {
  loginFormGroup:FormGroup;
  adminLoginmodel = new Admin('', '', '', 'Emailsss','Passwordsss');
  
  constructor( 
    private route: ActivatedRoute, 
    private router: Router, 
    private _adminLogin: AdminLoginService, 
    fb: FormBuilder 
  ){
    this.loginFormGroup = fb.group({
      'email' : [null...

内容的提问来源于stack exchange，提问作者Saswat