title: angular 8: Reactive Form match password
body: <p>I have the reactive form in my angular project that defines like this: </p>
  
  <pre><code>this.createUserFormGroup = new FormGroup({
    'userName': new FormControl(null, [Validators.required, Validators.maxLength(256)]),
    'name': new FormControl(null, [Validators.required, Validators.maxLength(64)]),
    'roleNames': new FormArray([]),
    'password': new FormControl(null, [Validators.required, Validators.maxLength(32)]),
    'confirmPassword': new FormControl(null, [Validators.required])
  });
  </code></pre>
  
  <p>how can I check the matching of password and confirmPassword?</p>