Examples field is not validated against openAPI 3.0.0 spec

Describe the bug No validation rule applies on the “Examples” field name defined in https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md#exampleObject –> All the fixed fields declared above are objects that MUST use keys that match the regular expression: ^[a-zA-Z0-9.-_]+$.

To Reproduce I created an openapi.yaml containing the following lines

parameters:
    - name: identifier
    - required: true
          in: path
          allowEmptyValue: false
          description: Some description
          examples:
            valid identifier:
              description: 'Some description'
              value: '49039557299384'

Running ‘redocly lint openapi.yaml’ returns that the file is valid.

The field name ‘valid identifier’ within the examples is invalid but I could not find any rule detecting this. An custom built assertion rule did not work because it only works for the value of a given property.

Expected behavior An error should be shown, that the ‘valid identifier’ is invalid

OpenAPI definition .redocly.yaml

lint:
  extends:
    - all

Specification version used: 3.0.0

Redocly Version(s) v1.0.0-beta.103

Node.js Version(s) v16.12.0

[tatomyr]

Basing on the internal discussion it’s been decided to implement this as a separate rule with the spec prefix.

[azimbelm]

Workaround for anyone who needs this now:

Create a Plugin/Custom Rule (use this guide: https://redocly.com/docs/cli/guides/response-contains-property/#response-contains-property.js) and use this code:

function ExampleKeyMatchesOASSpec () {
  return {
    Example(example, { key, report, location }) {
      if(new RegExp('^[a-zA-Z0-9\\.\\-_]+$').test(key) == false){
      //if (example.value || example.externalValue) {
        report({
          message: 'The key of the example "'+key+'" does not match the regular expression "^[a-zA-Z0-9\\.\\-_]+$"',
          location: location.key(),
        });
      }
  }
}}