On Thu, 20 Feb 2025 at 20:41, Phil Bouchard via Std-Proposals <
std-proposals_at_[hidden]> wrote:

> regex_match would get 1 more character on the need basis using in.get()
> quite simply. If it fails then it would rewind the read pointer to where
> it was.
>

How? iostream putback is extremely limited.



>
> I think that's a pretty efficient way of writing a decent parser.
>

Extracting one char at a time and then using std::regex repeatedly is
anything but efficient.