@redocly/openapi-core/src/rules/oas3/no-server-example.com.ts

See https://github.com/Redocly/redocly-cli

import type { Oas3Rule } from '../../visitors';

export const NoServerExample: Oas3Rule = () => {
  return {
    Server(server, { report, location }) {
      // eslint-disable-next-line no-useless-escape
      const pattern = /^(.*[\/.])?(example\.com|localhost)([\/:?].*|$)/;
      if (server.url && pattern.test(server.url)) {
        report({
          message: 'Server `url` should not point to example.com or localhost.',
          location: location.child(['url']),
        });
      }
    },
  };
};