Subject: bug#30681: closed (Re: bug#30681: What characters are in [[:space:]]?)

From: [email-masked] (GNU bug Tracking System)
Date: Fri, 02 Mar 2018 23:20:02 +0000

Your bug report

#30681: What characters are in [[:space:]]?

which was filed against the grep package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
30681: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=30681
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#30681: What characters are in [[:space:]]?
From: Jim Meyering <[email-masked]>
To: Paul Eggert <[email-masked]>
Cc: [email-masked], Peng Yu <[email-masked]>
Date: Fri, 2 Mar 2018 15:19:08 -0800
List-Id: <debbugs-submit.debbugs.gnu.org>

tags 30681 notabug
stop

On Fri, Mar 2, 2018 at 2:32 PM, Paul Eggert <[email-masked]> wrote:
> On 03/02/2018 09:23 AM, Peng Yu wrote:
>>
>> Where is this info documented for grep?
>
> It's not documented for grep because it's not part of grep. It's part of
> your locale.

You can check for yourself.
In every one of the 818 locales installed on a Fedora 27 system, I see
the same five bytes:

$ perl -e 'print pack ("C*", 0..255);'|grep -ao '[[:space:]]'|tr -d
'\n' |od -ac -An
  ht  vt  ff  cr  sp
  \t  \v  \f  \r

Subject: What characters are in [[:space:]]?
From: Peng Yu <[email-masked]>
To: [email-masked]
Date: Fri, 2 Mar 2018 11:23:22 -0600
List-Id: <debbugs-submit.debbugs.gnu.org>

Hi,

[[:space:]] includes the following unicode character.
http://www.fileformat.info/info/unicode/char/00a0/index.htm

$ echo 'a b' | grep 'a[[:space:]]b'
a b
$ echo 'a b'|xxd
00000000: 61c2 a062 0a                             a..b.

Where is this info documented for grep?

Are these all the possible white space characters?

http://jkorpela.fi/chars/spaces.html

-- 
Regards,
Peng