Why pathname did not match?

[inoyakaigor]

I using react-router@5 which under the hood uses [email protected]

I have path pattern /:projectKey/stat/:statType/:entryId?/(launch)?/:sublaunchpath?. It must match pathname /my_project/stat/campaigns/123456/launch/links-rating and it does only if the word launch is surrounded by parentheses: /(launch)?/

So my question is why the part /stat/ does not need parentheses but the /launch/ part does?

[blakeembrey]

I tested it on http://forbeslindesay.github.io/express-route-tester/ (and locally with 1.8.0) and it does match without the parentheses, can you share the path pattern you were trying to use?

Edit: Local results:

[inoyakaigor]

I must have phrased the question not clearly. My bad. I should have explicitly said that the part /launch/ is optional. I see in your screenshot that you removed parentheses with question mark.

[blakeembrey]

Does that mean you are trying to write /launch?/? The question mark there doesn’t mean anything, it doesn’t automatically know that the part you want to make optional is the preceding launch word which is why you must wrap it in parentheses. FWIW, there’s no example/README documentation that says this is possible so let me know if there’s somewhere the documentation can clarify this.