Email validation is being fired as we keep typing in textbox. I want this validation to be fired when user focuses out of the textbox

Below is my code:

```
<input class="form-control" pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,3}$"
 name="Email" type="email" [(ngModel)]="model.Email" #Email="ngModel" required>

<div class="red" *ngIf="Email.errors && (Email.dirty || Email.touched)">
     <div [hidden]="!Email.errors.pattern">
         Please enter a valid email.
     </div>
</div>

```

Please suggest me how can I achieve this.
Thanks in advance.