Re: regex.c simplification

[Clément Pit-Claudel]

On 2018-06-16 15:27, Perry E. Metzger wrote:
> On Sat, 16 Jun 2018 20:06:43 +0200 Andreas Schwab
> <address@hidden> wrote:
>> The problem is that none of the other regex implementations support
>> a gap.
> 
> Not quite. A couple of them (say TRE) support having a mechanism to
> fetch the next character rather than assuming they're present in a
> flat array or what have you, which would allow for dealing with a gap
> buffer.

Yeah, but TRE is unmaintained, and has open security issues on its tracker :/
PCRE *should* support a gap, but in practice it doesn't (suspending a search 
and resuming it in another buffer isn't guaranteed to give the same results as 
it would have on a single contiguous buffer).

There's some relevant context at 
https://lists.gnu.org/archive/html/emacs-devel/2016-12/msg00622.html

Clément.