According to grep man page:
...
Within a bracket expression, a range expression consists of two
characters separated by a hyphen. It matches any single character that sorts
between the two characters, inclusive, using the localeâs collating
sequence and character set. For example, in the default C locale, [a-d] is
equivalent to [abcd]. Many locales sort characters in dictionary order, and
in these locales [a-d] is typically not equivalent to [abcd]; it might be
equivalent to [aBbCcDd], for example. To obtain the traditional
interpretation of bracket expressions, you can use the C locale by setting
the LC_ALL environment variable to the value C.
...
> I reproduced the problem. My default locale is en_US.UTF-8.
>
> When I use:
>
> LC_ALL=en_US.iso-8859-8 egrep -n '[A-Z]'
>
> the lowercase letters are not matched.
>
> It is still mysterious to me why egrep (or grep) folds lowercase into
> uppercase when the locale is UTF-8.
>
> David Harel wrote:
> > In the commands below I insert data to grep via standard input and
> > terminate with <Ctrl-D>. Lines that match the expression are echoed
> > back. To improve visibility I used -n option so we can see the line
> > number of the matched line. BUT.
> > Can anyone explain the following behavior?
> > Did anyone fiddle with the weight of letters?
> >
> > Right
> > ==========================================================
> > [EMAIL PROTECTED] tmp]$ grep -n '[ABCDEFGHIJKLMNOPQRSTUVWXYZ]'
> > 123
> > abc
> > ABC
> > 3:ABC
> >
> >
> > Wrong
> > ====================================
> > [EMAIL PROTECTED] tmp]$ grep -n '[A-Z]'
> > 123
> > ABC
> > 2:ABC
> > abc
> > 3:abc
>
> --- Omer
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