title: Wordpress contact form 7 indian 10 digit phone number validation
body: <p>I want to validate "contact form 7" Indian 10 digit phone number validation without the plugin.</p>
  
  <p>Below is the pattern I used in the plugin:</p>
  
  <p>So, in the Contact Form 7 formatting.php module I changed like this but still, it is not validating:</p>
  
  <pre><code>function wpcf7_is_tel( $tel ) {
      $result = preg_match( '/^[+]?[0-10() -]*$/', $tel );
      return apply_filters( 'wpcf7_is_tel', $result, $tel );
  }
  </code></pre>