code: def _get_regions(self):
          
          if self._specs_in[_REGIONS_STR] == 'all':
              return [_get_all_objs_of_type(
                  Region, getattr(self._obj_lib, 'regions', self._obj_lib)
              )]
          else:
              return [set(self._specs_in[_REGIONS_STR])]
docs: Get the requested regions.