Trailing slashes at the end

Hi !

I have generated a new rule like that

$new_rules = array(
		'events/(.+)/(.+)/(.+).html$' => 'index.php?region='.
		$wp_rewrite->preg_index(1).'&cate='.
		$wp_rewrite->preg_index(2).'&membre='.
		$wp_rewrite->preg_index(3)
	);

    $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;

But when I try accessing a page it keep putting a slash at the end…

Thanks in advance !
GP