JS group names with same name

[elibarzilay]

Bug Description

Duplicate capture group names are now a thing, would be nice to have them.

Reproduction steps

As seen on that page:

/(?<year>\d{4})-\d{2}|\d{2}-(?<year>\d{4})/;

Expected Outcome

Should work.

Browser

Chrome, and therefore "most browsers" :)

(But not yet in node, so not most of that world, yet.)

[firasdib]

So as long as the groups are in different alternatives, the group name may be repeated? Or is there a more complex rule to implement for this?

[elibarzilay]

That was it looks like -- that page says:

A more recent feature allows named capturing groups to share names, as long as they belong to different disjunction alternatives and cannot be matched at the same time (see browser compatibility for this).