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Re: [Orgmode] Re: Bibtex and latex export

From: Nick Dokos
Subject: Re: [Orgmode] Re: Bibtex and latex export
Date: Thu, 07 Oct 2010 16:11:32 -0400

Eric S Fraga <address@hidden> wrote:

> >      echo /foo | egrep '^(/|[A-z]:/)'
> > 
> > do you get the bad range end error message? If so, then your egrep
> > is indeed stricter than mine.
> I do indeed:
> : egrep: Invalid range end.
> Very strange.
> > > > LC_ALL=C texi2dvi ...
> > > 
> > > but this may have unexpected side effects?  I'm not sure if any of the
> > > latex suite use the locale...
> > 
> > Yeah, perhaps...
> Interestingly, it *is* a locale issue:
> : $ echo /foo | LC_ALL=C egrep '^(/|[A-z]:/)'
> : /foo

Yup: the egrep man page says

| 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 locale’s
| 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.

So as Achim pointed out, unless texi2dvi explicitly specifies the locale
for egrep, that regexp is busted. Even [A-Za-z] is busted in the absence
of a locale: it would have to be something like [:alpha:], although I'm
not sure what DOS allows/requires as a drive prefix. And even in the C
locale, [A-z] allows non-letters which, I'm pretty sure, cannot be used
as drive prefixes.


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