fix(elements): double asterisks in path results in error

[porotkin]

Double Asterisks (**) in openapi path results in error

In general, make sure you have: (check the boxes to acknowledge you've followed this template)

• [x] Read CONTRIBUTING.md

Other Available PR Templates:

• Release: https://github.com/stoplightio/elements/compare?template=release.md
  • [x] Read the release section of CONTRIBUTING.md

Example:

1. open https://stoplight-elements.netlify.app/?path=/story/public-api--open-api-3-schema
2. add ** to any path (e.g. '/todos/{id} -> '/todos/{id}/**')

ER: Such path does not break the view. Displayed correctly AR: Unexpected error while parsing regexp.

Fixed behavior can be tested on netlify CI server

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[porotkin]

@P0lip, please, take a look :)

[brendarearden]

We are closing old PRs. Feel free to re-create if you are still looking to fix this issue.