Re: modern regexes in emacs

[Mattias Engdegård]

25 feb. 2019 kl. 15.47 skrev Lars Ingebrigtsen <address@hidden>:
> 
> I think it would be nice if Emacs had a regexp object.  That would allow
> us to extend Emacs in a compatible way somewhat seamlessly over a period
> of time.

Yes. Furthermore, there would be less need to rely on a cache of regexp 
compilation objects. Right now these are user-inaccessible; it is not possible 
to keep, query or manipulate them. The cache is finite and small, and 
occasionally thrashed. Enlarging the cache increases lookup times, and entries 
can still be evicted.

Reliably persistent regexp objects make it more viable to use expensive 
compilation methods, triggered by use thresholds or on request.