Return the list of registered filters (as a list of strings).

        The list **only** includes registered filters (**not** the predefined :program:`Jinja2` filters).

def registered_filters_list(self):
        """
        Return the list of registered filters (as a list of strings).

        The list **only** includes registered filters (**not** the predefined :program:`Jinja2` filters).

        """
        return [filter_name for filter_name in self.__jinja2_environment.filters.keys() if filter_name not in self.__jinja2_predefined_filters ]