missing named capture groups in String#matchAll

[cruzdanilo]

the groups property of the regex matches is undefined.

const string = 'Favorite GitHub repos: tc39/ecma262 v8/v8.dev';
const regex = /\b(?<owner>[a-z0-9]+)\/(?<repo>[a-z0-9\.]+)\b/g;
for (const match of string.matchAll(regex)) {
  console.log(`${match[0]} at ${match.index} with '${match.input}'`);
  console.log(`→ owner: ${match.groups.owner}`);
  console.log(`→ repo: ${match.groups.repo}`);
}

error:

TypeError: Cannot read property 'owner' of undefined

example from: https://v8.dev/features/string-matchall

[zloirock]

It's a duplicate of #521.