go-chi / go-chi/chi

Empty character in regex not getting matched

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Description

Hey there,

In https://github.com/go-chi/chi/pull/224, a check was added to short-circuit and return no matching route if the param value is empty.

I am trying the following regex in the router configuration to optionally match a route with an extension:

/v1/resource/done{:(^$|.json)} to match either /v1/resource/done.json or /v1/resource/done

Since the short-circuit kicks in because of the empty param value, the URL /v1/resource/done never matches that regex. Is there any other way to accomplish the same?

Thanks!

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  3. Fork the repository and make your change on a branch.
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Research direction

Start by reviewing PR #224 and the router's parameter-matching path for the route pattern /v1/resource/done{:(^$|.json)}. Reproduce matching both /v1/resource/done.json and /v1/resource/done; done means the empty parameter is handled consistently with the regex and both intended routes are covered by tests.

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Assessment

Tech stack
go
Domain
api, backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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