I needed to get the domain name only based on the base_url() function.
I added the following function to the url_helper.php :
/**
* Get domain
*
* Return the domain name only based on the "base_url" item from your config file.
*
* @access public
* @return string
*/
function getDomain()
{
$CI =& get_instance();
return preg_replace("/^[\w]{2,6}:\/\/([\w\d\.\-]+).*$/","$1", $CI->config->slash_item('base_url'));
}
So you can use it in your code in the same manner than site_url() or base_url()
Hope this help somebody !