td>
      <td>
        <a href="" class="label type-hint type-hint-string">string</a>
      </td>
      <td>
        <p>Sets <code>pattern</code> validation error key if the ngModel <a href="api/ng/type/ngModel.NgModelController#$viewValue">$viewValue</a>
   does not match a RegExp found by evaluating the Angular expression given in the attribute value.
   If the expression evaluates to a RegExp object, then this is used directly.
   If the expression evaluates to a string, then it will be converted to a Re