Look-behind proposal in trouble

Waldemar Horwat waldemar at google.com
Fri Oct 9 22:47:08 UTC 2015

On 10/09/2015 15:07, Nozomu Katō wrote:
> Since there was a comment about Perl5 style vs .NET style when I first
> posted my proposal to es-discuss, I just wanted to explain about the
> background of my proposal. I proposed Perl5 compatible lookbehinds
> because I thought it was relatively simple to implement. Moreover, I am
> not confident that I can write a lookbehind proposal based on .NET
> implementation, in the manner used in the ECMAScript specification.
> As Jason Orendorff wrote before, the lookbehind supported by .NET is a
> strict superset of what I have proposed. So, if you or someone else
> submits another lookbehind proposal based on .NET and it supersedes my
> proposal in a later version of ECMAScript, from the point of view of
> users, that would look like just an enhancement.

It's not a superset.  Captures would match differently.


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