AW: sed bug ?

[dietmar.schindler at manroland-web.com]

> Von: Timo Teräs
> Gesendet: Donnerstag, 17. November 2016 13:23
>
> On Thu, 17 Nov 2016 12:08:27 +0000
> <dietmar.schindler at manroland-web.com> wrote:
>
> > > Von: Timo Teras
> > > Gesendet: Donnerstag, 17. November 2016 10:56
> > >
> > > The following discrepancy happens on 1.25.1 (and git master) with
> > > musl c-library:
> > >
> > > ~ $ echo /usr/lib/ | sed 's,\(^/\|\)[^/][^/]*,..,g'
> > > ../../
> > >
> > > ~ $ echo /usr/lib/ | busybox sed 's,\(^/\|\)[^/][^/]*,..,g'
> > > /../../
> > >
> > > Any thoughts?
> >
> > The output of busybox sed is indeed incorrect.
>
> Someone replied offlist that the regexp is using \| which apparently is
> GNU extension. Apparently it would be better to convert the above to
> use ERE, or fix it in some other manner.

While POSIX sed is only required to support Basic Regular Expressions, BusyBox sed knows \| - otherwise the above expression would yield no substitution at all; older BusyBox versions (e. g. v1.20.2) did handle it correctly.
--
Regards,
Dietmar
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