[ trimmed Cc:, added autoconf-patches; followups can remove gcc@ ]
[ http://thread.gmane.org/gmane.comp.gcc.devel/108348 ]
* Dave Korn wrote on Wed, Aug 26, 2009 at 08:16:11PM CEST:
> Ralf Wildenhues wrote:
> > Patterns should not include the separator (unless escaped), even
> > as part of a character class. In conformance with Posix, the Cray
> > `sed' rejects `s/[^/]*$//': use `s,[^/]*$,,'.
> > [...]
> > Portable `sed' regular expressions should use `\' only to escape
> > characters in the string `$()*.0123456789[\^n{}'.
>
> Ah, I didn't read those two conditions as applying simultaneously.
I don't think they apply simultaneously in the way you interpreted that.
However, in the s,x\{1\,\},y, example, the comma is both a separator
and another metacharacter. Hmm, maybe those sentences don't really
cover this case.
How about
Patterns should not include the separator (unless escaped), even
as part of a character class. In conformance with Posix, the Cray
`sed' rejects `s/[^/]*$//': use `s,[^/]*$,,'. Even escaped,
patterns should not include separators that are also used as
metacharacters. For example, GNU sed 3.02 rejects `s,x\{1\,\},,',
and is used on MinGW.
?
Cheers,
Ralf
