Re: Regexp for c-or-c++-mode

[Alan Mackenzie]

Hello, Micha�.

On Thu, Jun 11, 2020 at 00:42:25 +0100, Michał Nazarewicz wrote:
> On Wed, 10 Jun 2020 at 15:15, Robert Pluim <rpluim@gmail.com> wrote:

> > >>>>> On Wed, 10 Jun 2020 14:58:18 +0100, Michał Nazarewicz 
> > >>>>> <mina86@mina86.com> said:

> >     Michał> On Wed, 10 Jun 2020 at 12:40, Robert Pluim <rpluim@gmail.com> 
> > wrote:
> >     Michał> I suppose you’re right. It should be [ \t\v\f] instead to catch
> >     Michał> all non-new-line white-space characters. Or [ \t\v\f\r\n] to 
> > catch
> >     Michał> all white-space characters.

> >     >> [[:blank:]] ?

> >     Michał> [[:blank:]] is defined in terms of Unicode properties so that 
> > would
> >     Michał> catch things which C does not consider white-space.

> > [[:space:]] then, which uses the buffer's syntax table.

> The regex under discussion needs to adhere to C syntax but is (may be)
> used outside of cc-mode and thus should not rely on syntax table being
> set up for C.

How about using simply [ \t]?  The \r doesn't really add any utility,
just confusion, and there seem not to have been any problems with
c-or-c++-mode so far.  Like you said, including the "bigger" whitespace
characters might lead to false positives.

> -- 
> Best regards
> ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
> «If at first you don’t succeed, give up skydiving»

-- 
Alan Mackenzie (Nuremberg, Germany).