Eric Blake wrote:
They still don't make any sense in any locale except C, because POSIX no
longer requires collating order.
The regex(7) man page says that [xx-xx] uses ***collating order**::
The regex(7) man page _of which system_? Just because _some_ systems
(like glibc, picking the POSIX 1992 semantics) have well-defined
semantics, doesn't mean that all systems have those same semantics.
According to POSIX, you cannot portably assume ANY semantics for ranges
except in the C locale. And if RRI gains traction, that means that you
can assume ASCII collation, across ALL locales, but this is a different
order than collation of a specific locale, and it is also a GNU
extension not guaranteed by POSIX.
===
Well, that would be nice, but if Unicode takes off, *cough*,
and anyone claims unicode compliance (isn't UTF-8 the standard for HTML5
and XML?), they are also guaranteed ordering -- full ordering for the full
Unicode character set.
It would be VERY GOOD if RRI didn't come up with an order that
was DIFFERENT from that prescribed by Unicode -- otherwise that could open
another can of worms.
