title: How to disable special characters in angular Js input tag. Only allow alphanumeric(PAN Card Validation Regex)
body: <p>How to disable special characters in angular js input tag. Only allow alphanumeric
  just like we use </p>
  
  <pre><code>&lt;input type="text" ng-trim="false" style="text-transform: uppercase" ng-pattern="/^[a-zA-Z0-9]*$/" class="form-text" id="pan_card_number" name="pan_card_number" ng-minlength="10" maxlength="10" required ng-model="registration.newTSP.panCardNumber"&gt;
  </code></pre>