Wordpress functions.php snippet to add Google Analytics tracking to wp_nav_menu with Yoast's plugin

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/*
For use in functions.php in combination with: 
  http://wordpress.org/extend/plugins/google-analytics-for-wordpress/
*/

add_filter('wp_nav_menu', 'menu_ga_tracking', 99);

function menu_ga_tracking($menu) {
	if( class_exists('GA_Filter') and yoast_ga_do_tracking() ) {
		$menu = preg_replace_callback(
					'/<a (.*?)href=[\'\"](.*?)\/\/([^\'\"]+?)[\'\"](.*?)>(.*?)<\/a>/i',
					'ga_parse_menu_links',
					$menu
				);
	}
	return $menu;
}

function ga_parse_menu_links($matches){
	return GA_Filter::ga_parse_link('outbound-menu',$matches);
}