Date: Tue, 30 Jun 2015 16:22:41 +0200
From: Natanael Copa <ncopa@alpinelinux.org>
To: Michael Fox <415fox@gmail.com>
Cc: alpine-devel <alpine-devel@lists.alpinelinux.org>, Lasse Collin
 <lasse.collin@tukaani.org>
Subject: Re: [alpine-devel] Re: xzdiff in xz package is broken on alpine
 linux
Message-ID: <20150630162241.549c514a@ncopa-desktop.alpinelinux.org>
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	<CABbL6obHpR9kV_h-LMwr2efEZ8Nk6wyVV1sj44MT2Yx98gWC+Q@mail.gmail.com>
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On Mon, 29 Jun 2015 10:07:59 -0700
Michael Fox <415fox@gmail.com> wrote:

> CC xz maintainer whose email I got wrong the first time


> 
> On Mon, Jun 29, 2015 at 8:27 AM, Michael Fox <415fox@gmail.com> wrote:
> 
> > I found this by running make check. It's probably due to xzdiff being a
> > shell script with some hair regexs and musl having some regex
> > incompatibilities in the name of standards compliance.
> >
> > Another one that bit me today was in a script with
> >
> >     grep '^[a-z]\+'

\+ is a gnu extension and not a posix Basic Regular Expression (BRE).
You cannot expect those work anywhere except with GNU.

> > On alpine you need to say
> >
> >     grep '^[a-z]+'

You need -E for extended regepx (ERE):

  grep -E '^[a-z]+'


That should be portable.

-nc


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