To specify a subset of regions for Skypilot to search within to find resources, you can use the any_of directive in the Skypilot configuration file. Here is an example configuration that specifies multiple regions to search within:

resources:
  accelerators: {A10g:8, A10:8, L4:8, A100:8}
  any_of:
    # AWS:
    - region: us-east-1
    - region: us-east-2
    - region: us-west-1
    - region: us-west-2
    # GCP
    - region: us-central1
    - region: us-east1
    - region: us-east4
    - region: us-west1
    - region: us-west2
    - region: us-west3
    - region: us-west4