Look-behind proposal in trouble

Nozomu Katō noz.ka at akenotsuki.com
Sun Oct 4 11:52:18 UTC 2015

Apparently my proposal for adding the look-behind assertions to RegExp
has been in trouble. I would like to ask anyone for help.

The following story is what I know about the proposal after my previous

I created a pull request for the proposal in July and sent an email to
Brendan Eich asking if I can put his name as a champion:

I have not received a reply to my email, but I received a notification
email in September that replying to the pull request, the proposal was
moved to stage 0. Today, however, I just noticed that the proposal had
been dropped from stage 0, stating "RegExp lookbehind has no champion".
https://github.com/tc39/ecma262/commits/master/stage0.md (Oct 4, 2015)

I am uncertain about what happened. Does this mean that Brendan Eich is
no longer a champion or did not take a champion on from the beginning or


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