bbPress::add_rewrite_tags()

    public static function add_rewrite_tags() {
        add_rewrite_tag( '%' . bbp_get_view_rewrite_id()               . '%', '([^/]+)'   ); // View Page tag
        add_rewrite_tag( '%' . bbp_get_edit_rewrite_id()               . '%', '([1]{1,})' ); // Edit Page tag
        add_rewrite_tag( '%' . bbp_get_search_rewrite_id()             . '%', '([^/]+)'   ); // Search Results tag
        add_rewrite_tag( '%' . bbp_get_user_rewrite_id()               . '%', '([^/]+)'   ); // User Profile tag
        add_rewrite_tag( '%' . bbp_get_user_favorites_rewrite_id()     . '%', '([1]{1,})' ); // User Favorites tag
        add_rewrite_tag( '%' . bbp_get_user_subscriptions_rewrite_id() . '%', '([1]{1,})' ); // User Subscriptions tag
        add_rewrite_tag( '%' . bbp_get_user_topics_rewrite_id()        . '%', '([1]{1,})' ); // User Topics Tag
        add_rewrite_tag( '%' . bbp_get_user_replies_rewrite_id()       . '%', '([1]{1,})' ); // User Replies Tag
    }