Range with lookaround

[Seb via Digitalmars-d]

On Friday, 3 March 2017 at 11:56:26 UTC, Dukc wrote:
> On Thursday, 2 March 2017 at 01:44:19 UTC, Andrei Alexandrescu 
> wrote:
>> May be worth discussing in here: 
>> https://issues.dlang.org/show_bug.cgi?id=17238 -- Andrei
>
> Almost similar to this: 
> https://github.com/dlang/phobos/pull/4027
>
> Perhaps we should use that as base?

My PR even included such a circular buffer until Andrei suggested 
to move it to a separate PR.
However, I think we are all misunderstanding  Andrei. He isn't 
referring to a buffer here - have a look at the issue.