Gravity PHP Postcode

// 1 - Tie our validation function to the 'gform_validation' hook
add_filter('gform_validation_1', 'checkPostcode');
function checkPostcode (&$toCheck) {

        if (!checkPostcode ($postcode) ) {
      echo 'Invalid postcode <br>';
    }


  // Permitted letters depend upon their position in the postcode.
  $alpha1 = "[abcdefghijklmnoprstuwyz]";                          // Character 1
  $alpha2 = "[abcdefghklmnopqrstuvwxy]";                          // Character 2
  $alpha3 = "[abcdefghjkpmnrstuvwxy]";                            // Character 3
  $alpha4 = "[abehmnprvwxy]";                                     // Character 4
  $alpha5 = "[abdefghjlnpqrstuwxyz]";                             // Character 5
  $BFPOa5 = "[abdefghjlnpqrst]{1}";                               // BFPO character 5
  $BFPOa6 = "[abdefghjlnpqrstuwzyz]{1}";                          // BFPO character 6

  // Expression for BF1 type postcodes
  $pcexp[0] =  '/^(bf1)([[:space:]]{0,})([0-9]{1}' . $BFPOa5 . $BFPOa6 .')$/';

  // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA with a space
  $pcexp[1] = '/^('.$alpha1.'{1}'.$alpha2.'{0,1}[0-9]{1,2})([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/';

  // Expression for postcodes: ANA NAA
  $pcexp[2] =  '/^('.$alpha1.'{1}[0-9]{1}'.$alpha3.'{1})([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/';

  // Expression for postcodes: AANA NAA
  $pcexp[3] =  '/^('.$alpha1.'{1}'.$alpha2.'{1}[0-9]{1}'.$alpha4.')([[:space:]]{0,})([0-9]{1}'.$alpha5.'{2})$/';

  // Exception for the special postcode GIR 0AA
  $pcexp[4] =  '/^(gir)([[:space:]]{0,})(0aa)$/';

  // Standard BFPO numbers
  $pcexp[5] = '/^(bfpo)([[:space:]]{0,})([0-9]{1,4})$/';

  // c/o BFPO numbers
  $pcexp[6] = '/^(bfpo)([[:space:]]{0,})(c\/o([[:space:]]{0,})[0-9]{1,3})$/';

  // Overseas Territories
  $pcexp[7] = '/^([a-z]{4})([[:space:]]{0,})(1zz)$/';

  // Anquilla
  $pcexp[8] = '/^ai-2640$/';

  // Load up the string to check, converting into lowercase
  $postcode = strtolower($toCheck);

  // Assume we are not going to find a valid postcode
  $valid = false;

  // Check the string against the six types of postcodes
  foreach ($pcexp as $regexp) {

    if (preg_match($regexp,$postcode, $matches)) {

      // Load new postcode back into the form element
    	  $postcode = strtoupper ($matches[1] . ' ' . $matches [3]);

      // Take account of the special BFPO c/o format
      $postcode = preg_replace ('/C\/O([[:space:]]{0,})/', 'c/o ', $postcode);

      // Take acount of special Anquilla postcode format (a pain, but that's the way it is)
      if (preg_match($pcexp[7],strtolower($toCheck), $matches)) $postcode = 'AI-2640';

      // Remember that we have found that the code is valid and break from loop
      $valid = true;
      break;
    }
  }

  // Return with the reformatted valid postcode in uppercase if the postcode was
  // valid
  if ($valid){
	  $toCheck = $postcode;
		return true;
	}
	else return false;
}
/*gravity dustin*/
/**
* Better Pre-submission Confirmation
* http://gravitywiz.com/2012/08/04/better-pre-submission-confirmation/
*/

class GWPreviewConfirmation {

    private static $lead;

    function init() {

        add_filter('gform_pre_render', array('GWPreviewConfirmation', 'replace_merge_tags'));
        add_filter('gform_replace_merge_tags', array('GWPreviewConfirmation', 'product_summary_merge_tag'), 10, 3);

    }

   public static function replace_merge_tags($form) {

        $current_page = isset(GFFormDisplay::$submission[$form['id']]) ? GFFormDisplay::$submission[$form['id']]['page_number'] : 1;
        $fields = array();

        // get all HTML fields on the current page
        foreach($form['fields'] as &$field) {

            // skip all fields on the first page
            if(rgar($field, 'pageNumber') <= 1)
                continue;

            $default_value = rgar($field, 'defaultValue');
            preg_match_all('/{.+}/', $default_value, $matches, PREG_SET_ORDER);
            if(!empty($matches)) {
                // if default value needs to be replaced but is not on current page, wait until on the current page to replace it
                if(rgar($field, 'pageNumber') != $current_page) {
                    $field['defaultValue'] = '';
                } else {
                    $field['defaultValue'] = self::preview_replace_variables($default_value, $form);
                }
            }

            // only run 'content' filter for fields on the current page
            if(rgar($field, 'pageNumber') != $current_page)
                continue;

            $html_content = rgar($field, 'content');
            preg_match_all('/{.+}/', $html_content, $matches, PREG_SET_ORDER);
            if(!empty($matches)) {
                $field['content'] = self::preview_replace_variables($html_content, $form);
            }

        }

        return $form;
    }