Re: have you ever mistyped [[:lower:]] as [:lower:] ?

[Paolo Bonzini]

On 09/01/2010 04:01 PM, Jim Meyering wrote:
> > Do you honestly imagine
> > http://opengroup.org/onlinepubs/007908775/xbd/re.html changed to say
> > "If a bracket expression consists of a colon, a series of alphabetic
> > characters, and another colon, the implementation's behavior is
> > undefined?
>
> Perhaps that is where we disagree, then.
> I do not require that POSIX allow the new behavior.

That may be it.  In particular, I think for something that POSIX is 
unlikely to aver allow, there should be another way than POSIXLY_CORRECT 
to disable it.

> > >  "We have nothing to fear but fear itself".
> > >  But I doubt you're seriously worried about [A-Z], etc.
> >
> >  Not worried, but it honestly would be a sensible warning whenever
> >  strcoll ("A", "f")<= 0&&  strcoll ("f", "Z")<= 0, as is the case in
> >  UTF-8 locales with glibc.  It will basically never do the right thing,
> >  since [A-Z] and [a-z] exclude a and Z respectively.
>
> Ranges like [A-Z] are so common that changing the default
> would have far-reaching effects.  Will it ever be possible?
> I don't know.  Perhaps if we first allow it to be enabled via
> some new environment variable, and then, much later, make it the default.

/me whispers --warn...

Paolo