Re: have you ever mistyped [[:lower:]] as [:lower:] ?

[Jim Meyering]

Paul Eggert wrote:
> On 09/01/2010 07:25 AM, Eric Blake wrote:
>
>> Personally, I'd _like_ to try to get POSIX to allow unspecified behavior
>> for a bracket expression that starts and ends with colon,
>
> Likewise.  Thanks for starting the Aardvark at
> <http://austingroupbugs.net/view.php?id=305>.
>
> I was amused to see that, under its argument,
> grep is already within its rights to reject [:space:]
> even when conforming to POSIX.

Amusing, indeed.
Then we wouldn't even need to bother with POSIXLY_CORRECT.