http://wp.smashingmagazine.com/2011/10/14/advanced-layout-te

<?php
// http://wp.smashingmagazine.com/2011/10/14/advanced-layout-templates-in-wordpress-content-editor/

// Gets inner HTML for each column, omits the column div so we can apply markup if needed
    function get_inner_html( $node ) {
      foreach($node->childNodes as $value) {
          $html .= $node->ownerDocument->saveXML($value, LIBXML_NOEMPTYTAG);
      }

      return $html;
    }

           $posts = get_posts(array(
                'numberposts' => 1,
                'post_type'   => 'my_custom_post'
            ));

            foreach($posts as $post) :
                setup_postdata($post);

                // Apply content filter to preserve <p> tags
                $content = get_the_content();
                $content = apply_filters('the_content', $content);

                $doc = new DOMDocument();
                $doc->loadHTML($content);

                $xpath = new DOMXPath($doc);

                // Find the divs via xpath
                $col_1 = get_inner_html($xpath->query('//div[@class="content-col-1"]')->item(0));
                $col_2 = get_inner_html($xpath->query('//div[@class="content-col-2"]')->item(0));
                $col_3 = get_inner_html($xpath->query('//div[@class="content-col-3"]')->item(0));

                // Now use your columns as needed!
                ?>
                <div class="content-col-1">
                    <div class="content">
                        <?php echo $col_1; ?>
                    </div>
                </div>