Re: [PATCH v2 1/3] git-submodule: New subcommand 'summary' (1) - code framework

["Ping Yin" <pkufranky@gmail.com>]

On Sun, Mar 2, 2008 at 4:52 AM, Junio C Hamano <gitster@pobox.com> wrote:
> "Ping Yin" <pkufranky@gmail.com> writes:
>
>
>
> >>  > +             grep '^:160000\|:[0-9]\+ 160000' |
>  >>
>  >>  This looks troublesome.
>  >>
>  >>   - [0-9] is obviously wrong and [0-7] is what you meant;
>  >>   - \| and \+ are not BRE but GNU.
>  >>
>  > man grep says
>  >  In  basic regular expressions the metacharacters ?, +, {, |, (, and )
>  > lose their special meaning; instead use the backslashed versions \?,
>  > \+, \{, \|, \(, and \).
>  >
>  > Doen't it mean that '\|' is BRE ?
>
>  It just says unlike in ERE, these characters are not special in BRE; it
>  does not at all say using backslash like \?, \+, and \| makes them so.
>
>  And they are not.  \(...\), \{m\}, \{m,\} and \{m,n\} are part of BRE, but
>  the two you used (\+ and \|) are not.  GNU accept these two as extensions,
>  but other POSIX implementations may have troubles with them.
>
>   http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap09.html
>
>  Please be gentle to porters to non GNU systems.  Either stay inside BRE
>  (which I think we have managed to do with our usage of grep) or explicitly
>  ask for ERE with "grep -E".
>
ok, 3x.


-- 
Ping Yin