public function html_css_class($vis, $expand) { $class = parent::html_css_class($vis, $expand); if (preg_match('/\\t| /m', substr($this->raw, 0, 1))) { $class[] = 'leadspc'; } if (preg_match('/\\t| /m', substr($this->raw, -1))) { $class[] = 'trailspc'; } return $class; }