Why do we validate the server variables? There is no such limitation in OpenAPI 3 specification

[xg1990]

Problem description

if we have a openapi 3.0 specification like this:

servers:
  - url: https://api.example.com/{basePath}
    description: Production server (uses live data)
    variables:
        basePath:
            default: "v1/path-a/path-b/pathC

It will report error that the basePath doesn't match the pattern "[^\/#\?]+?"

Discussion

This pattern check comes from the package path-to-regexp.

But I don't think we need such constrains. There is no such limitation in OpenAPI 3 specification

According to https://swagger.io/docs/specification/api-host-and-base-path/, it says:

Variables can have arbitrary values, or may be restricted to an enum.