Fixed overlay for more templates

I made updates for core function of overlay mode. I thnik now it should work for nearly all templates. It is universal as long as possible.

// refactoring of function: S:\nfs\www\wp\www\wp-content\plugins\image-source-control-isc\isc.class.php
    public function get_image_by_url($url = '')
    {
      global $wpdb;

      if (empty($url))
      {
        return 0;
      }

      $types = implode('|', $this->_allowedExtensions);

      /**
       * check for the format 'image-title-(e12452112-)300x200.jpg(?query…)' and removes
       *   the image size
       *   edit marks
       *   additional query vars
       */
      $newurl = esc_url(preg_replace("/(-e\d+){0,1}(-\d+x\d+){0,1}\.({$types})(.*)/i", '.${3}', $url));

      // remove protocoll (http or https)
      // $newurl = str_ireplace(array('http:', 'https:'), '', $newurl);
      $newurl = preg_replace("#^(http)s?://[a-z0-9.-]+(/.+)$#i", '$2', $newurl);
      $newurl = "^.*".str_replace(".", '\.', $newurl)."$";

      $sql = "SELECT ID FROM <code>&quot;.$wpdb->posts.&quot;</code>";
      $sql .= " WHERE guid REGEXP %s";
      $sql .= " AND post_type='attachment'";
      $sql .= ' LIMIT 1';

      // not escaped, because escaping already happened above
      $raw_query = $wpdb->prepare($sql, $newurl);

      $query     = apply_filters('isc_get_image_by_url_query', $raw_query, $newurl);
      $id        = $wpdb->get_var($query);

      return $id;
    }

// S:\nfs\www\wp\www\wp-content\plugins\image-source-control-isc\public\public.php
      public function content_filter($content)
      {

        // display inline sources
        $options = $this->get_isc_options();

        if (isset($options['display_type']) && is_array($options['display_type']) && in_array('overlay', $options['display_type']))
        {
          //$pattern = '#(\[caption.*align="(.+)"[^\]*]{0,}\])? *(<a [^>]+>)? *(<img .*class=".*(alignleft|alignright|alignnone|aligncenter)??.*wp-image-(\d+)\D*".*src="(.+)".*/?'.'>).*(?(3)(?:</a>)|.*).*(?(1)(?:\[/caption\])|.*)#isU';
          $pattern = '#<img .*src="(.+)".*/?'.'>#isU';
          $count   = preg_match_all($pattern, $content, $matches);

          if (FALSE !== $count)
          {
            for ($i = 0; $i < $count; $i++)
            {
              // get source
              $src = $matches[1][$i];
              $id  = $this->get_image_by_url($src);

              // don’t show caption for own image if admin choose not to do so
              if ($options['exclude_own_images'])
              {
                if (get_post_meta($id, 'isc_image_source_own', TRUE))
                {
                  continue;
                }
              }

              //die_dump($this->get_source_by_url($src));
              if (!$source_string = $this->render_image_source_string($id))
              {
                continue;
              }

              // add space if needed
              $options['source_pretext'] .= $options['source_pretext'] ? ' ' : '';

              $source      = '<p class="isc-source-text">'.$options['source_pretext'].$source_string.'</p>';
              $old_content = $matches[0][$i];

              // add own class with-source and/or if missing add unique class for image
              if (preg_match("/wp-image-".$id."/i", $old_content))
              {
                $new_content = str_replace('wp-image-'.$id, 'wp-image-'.$id.' with-source', $old_content);
              }
              else
              {
                $new_content = str_replace('class="', 'class="wp-image-'.$id.' with-source ', $old_content);
              }

              // find alignment
              if (preg_match('/class="[^"]*(alignleft|alignright|alignnone|aligncenter)[^"]*"/i', $old_content, $alignment))
              {
                $alignment = $alignment[1];
              }
              else
              {
                $alignment = '';
              }

              $content = str_replace($old_content, '<div id="isc_attachment_'.$id.'" class="isc-source '.$alignment.'"> '.$new_content.$source.'</div>', $content);
            }
          }
        }