On Wed, Jul 18, 2018 at 08:04:05AM +0200, Florian Weimer wrote:
> * Zorro Lang:
> >> > > This is related to this glibc bug:
> >> > > 
> >> > >   https://sourceware.org/bugzilla/show_bug.cgi?id=23393
> >> 
> > A stranger thing is:
> > egrep [A-Z] match ABCD and bcd, but not match 'a'...
> That's the same issue as [0-9] not matching 9.
> > I already can't understand the new rules ...
> The range operator matches characters according to their collation
> weight, and sincce the weight of 'a' is less than the weight of 'A',
> 'a' is not included in the [A-Z] range.

How to define/calculate the *weight* in your context? Why you say the
weight of 'a' is less than the weight of 'A'

> This could be fixed by including all characters with the same primary
> weight as the endpoints (so that [ā-ẑ] and [a-z] would end up being
> the same).  It makes the behavior more logical, but it doesn't fix
> existing scripts.

We find that the $LANG will affect how glibc deal with the wildcard.
We all test on LANG=en_US.UTF=8, but if I set export LANG=C, then
[a-z] and [A-Z] are all as expected, and xfstests make install works.


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