Wordpress: remove classes from wp_list_pages

snippet.php

// just add this to functions.php

function remove_page_class($wp_list_pages) {
	$pattern = '/\<li class="page_item[^>]*>/';
	$replace_with = '<li>';
	return preg_replace($pattern, $replace_with, $wp_list_pages);
}
add_filter('wp_list_pages', 'remove_page_class');