When I test the same using woody with locales version 2.2.5-11.5, it
work as it should.
minerva:~# grep en_US /etc/locale.gen
en_US UTF-8
minerva:~# locale-gen
Generating locales...
[...]
en_US.UTF-8... done
[...]
Generation complete.
minerva:~# echo '[' | LANG=en_US.UTF-8 egrep '^[^[:space:]]+$'
[
minerva:~# echo '[' | LANG=en_US egrep '^[^[:space:]]+$'
[
minerva:~# echo '[' | LANG=C egrep '^[^[:space:]]+$'
[
minerva:~#
Comparing the en_US locale, there are no changes. But both include
the i18n "locale", and this changed between the versions. It was
updated to use Unicode version 3.2 form version 3.0 I do not know the
CTYPE part of the locale well enough to say if the changes are
relevant or not. I found nothing in the change modifying the
behaviour of <U005B>, which I believe is the value for '['.
Could it be some regex error in glibc?
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