Re: bug on {,} : result of {,10} compar to {5,10},

[Guillaume Moulard]

Hi,
I have view this syntax on the man page. 

Guillaume

Le 18 avr. 2013 à 19:54, Eric Blake <address@hidden> a écrit :

> On 04/18/2013 10:46 AM, Paul Eggert wrote:
>> On 04/18/13 08:24, Eric Blake wrote:
>>> {,10} is therefore undefined by POSIX.
>> 
>> It is defined in the grep manual (in the
>> node Fundamental Structure), as being
>> equivalent to {0,10}, so there does appear
>> to be a bug here.
> 
> Indeed, we have changed behavior over time; my Fedora 18 box has nicer
> behavior:
> 
> $ rpm -q grep
> grep-2.14-1.fc18.x86_64
> $ echo guillaumeeeeeeeguillaume | grep -E "guillaume{,10}gui"
> guillaumeeeeeeeguillaume
> 
> Guillaume was using grep 2.6.3 on Cygwin.  I don't directly see it in
> grep's NEWS, although one of these two releases is probably responsible:
> 
> 2.12:
>  grep -E 'a{1000000000}' now reports an overflow error rather than
>  silently acting like grep -E 'a\{1000000000}'.
> 
> 2.7:
>  X{0,0} is implemented correctly.  It used to be a synonym of X{0,1}.
>  [bug present since "the beginning"]
> 
> At this point, it might be worth asking the Cygwin folks to package a
> newer grep, to pick up this (and other) fixes, but there's nothing to do
> upstream, unless we want to improve old NEWS entries.
> 
> -- 
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>