Simple Post Type Archive Filter Rewrites

    /**
     * Adjust the rewrite rules for News & Events
     *
     * Adds a simple "status" query variable to the News post type archive
     * to allow filtering the archive by a post meta field for event_date.
     * Allowed statuses are: upcoming, past, and posts (for non-event entries).
     * Also allows paging within the status filters.
     *
     * @since   1.0.0
     */
    public function register_event_rewrite_rules() {
        add_rewrite_tag( '%status%', '([^&]+)' );
        add_rewrite_rule( '^news/(upcoming|past|posts)/?$', 'index.php?post_type=news&status=$matches[1]', 'top' );
        add_rewrite_rule( '^news/(upcoming|past|posts)/page/?([0-9]{1,})/?$', 'index.php?paged=$matches[2]&post_type=news&status=$matches[1]', 'top' );
        add_rewrite_rule( '^news/status/(upcoming|past|posts)/?$', 'index.php?post_type=news&status=$matches[1]', 'top' );
        add_rewrite_rule( '^news/status/(upcoming|past|posts)/page/?([0-9]{1,})/?$', 'index.php?paged=$matches[2]&post_type=news&status=$matches[1]', 'top' );
    }