code: def _get_validated_enabled_regions(json_spec, from_command_line):
      
      enabled_regions = dxpy.executable_builder.get_enabled_regions('globalworkflow',
                                                                    json_spec,
                                                                    from_command_line,
                                                                    WorkflowBuilderException)
      if not enabled_regions:
          enabled_regions = []
          if not dxpy.WORKSPACE_ID:
              msg = "A context project must be selected to enable a workflow in the project's region."
              msg += " You can use 'dx select' to select a project. Otherwise you can use --region option"
              msg += " to select a region in which the workflow should be enabled"
              raise(WorkflowBuilderException(msg))
          region = dxpy.api.project_describe(dxpy.WORKSPACE_ID,
                                             input_params={"fields": {"region": True}})["region"]
  
          enabled_regions.append(region)
  
      if not enabled_regions:
          raise AssertionError("This workflow should be enabled in at least one region")
  
      return set(enabled_regions)
docs: Returns a set of regions (region names) in which the global workflow
      should be enabled. Also validates and synchronizes the regions
      passed via CLI argument and in the regionalOptions field.