Backward running version look-behinds

Yang Guo yangguo at
Fri Dec 11 17:46:28 UTC 2015

The newly proposed regexp features are mostly self-contained. Does it make
sense to bundle them? I'm curious what the benefit of that might be.


On Fri, Dec 11, 2015, 18:34 Gorkem Yakin <goyakin at> wrote:

> At the November TC39 meeting, it was agreed that the new RegExp proposals
> would advance together, hence it's at stage 0.
> As for the spec text, Nozomu has something written up [1], but I haven't
> had the time to review it yet.
> Gorkem
> [1]
> -----Original Message-----
> From: es-discuss [mailto:es-discuss-bounces at] On Behalf Of
> Domenic Denicola
> Sent: Friday, December 11, 2015 8:42 AM
> To: Yang Guo <yangguo at>; es-discuss at
> Subject: RE: Re: Backward running version look-behinds
> From: es-discuss [mailto:es-discuss-bounces at] On Behalf Of
> Yang Guo
> > - We have a spec draft:,
> > - We have champions: Gorkem Yakin, Nozomu Katō and Brian Terlson
> Hmm, but none of the champions are writing the spec? Probably just want to
> add Claude to the champion list.
> > Can we move this to stage 2?
> I agree this looks stage 2 worthy. However, the committee has so far
> exhibited the unfortunate dysfunction of being unable to move things
> between stages except during face to face meetings.
> At this point I would personally suggest the following. Unofficially,
> consider this to be stage 2; your obligations seem met, even if the
> committee hasn't had time to convene in meatspeace and bless your work.
> Now, start looking at what's required for stage 3: being sure the spec text
> is complete; finding designated reviewers and getting them to sign off; and
> getting Brian, the editor, to sign off on the spec text. If you can get
> those additional things together in time for the January meeting, you
> should be able to use that meeting to jump from stage 1 to stage 3.
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