`URLPattern.exec(string)` implementation differs from the node polyfill

[adriannsemb]

Hi,

I'm linking issue here from:

• https://github.com/denoland/deno/issues/28247

as this library contains the implementation of URLPattern for deno.

---

Deno's URLPattern.exec(string) implementation differs from the node polyfill, which is causing some libraries to behave inconsistently or even break when running in Deno.

const pattern = ":protocol://:domain(.*)::port?/:locale(de)?/:path(.*)?";
const url = "https://localhost:5173/de";

const urlpattern = new URLPattern(pattern);
const match = urlpattern.exec(url);

console.log(match);

expected

{
  "inputs": ["https://localhost:5173/de"],
  "protocol": { "input": "https", "groups": { "protocol": "https" } },
  "username": { "input": "", "groups": { "0": "" } },
  "password": { "input": "", "groups": { "0": "" } },
  "hostname": { "input": "localhost", "groups": { "domain": "localhost" } },   //<----------
  "port": { "input": "5173", "groups": { "port": "5173" } },
  "pathname": { "input": "/de", "groups": { "locale": "de", "path": undefined } },
  "search": { "input": "", "groups": { "0": "" } },
  "hash": { "input": "", "groups": { "0": "" } }
}

actual

{
  "inputs": ["https://localhost:5173/de"],
  "protocol": { "input": "https", "groups": { "protocol": "https" } },
  "username": { "input": "", "groups": { "0": "" } },
  "password": { "input": "", "groups": { "0": "" } },
  "hostname": { "input": "localhost", "groups": { "0": "localhost" } },        //<----------
  "port": { "input": "5173", "groups": { "port": "5173" } },
  "pathname": { "input": "/de", "groups": { "locale": "de", "path": undefined } },
  "search": { "input": "", "groups": { "0": "" } },
  "hash": { "input": "", "groups": { "0": "" } }
}

difference

hostname.groups object does not contain the expected named group (domain), while in Chrome/Node's polyfill, it does ("groups": { "domain": "localhost" }).