helm-external-secrets/docs/snippets/datafrom-rewrite-invalid-characters.yaml

apiVersion: external-secrets.io/v1beta1
kind: ExternalSecret
metadata:
  name: example
spec:
  refreshInterval: 1h
  secretStoreRef:
    kind: SecretStore
    name: backend
  target:
    name: secret-to-be-created
  dataFrom:
  - extract:
      key: development
    rewrite:
    - regexp:
        source: "[^a-zA-Z0-9 -]"
        target: "_"