title: Validation pattern for date in DD/MM/YYYY format using angular2
body: <p>How to add validation pattern for Date in DD/MM/YYYY format using angular2 Validator.pattern.</p>
  
  <p>I have the "required" validator in place. Cannot find one for date pattern. Code as below: </p>
  
  <pre><code>this.txtDob = new Control("", Validators.compose([Validators.required]));
  </code></pre>