GNU bug report logs - #30681
What characters are in [[:space:]]?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Peng Yu <pengyu.ut <at> gmail.com>
To: bug-grep <at> gnu.org
Subject: What characters are in [[:space:]]?
Date: Fri, 2 Mar 2018 11:23:22 -0600

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

Message #8 received at 30681 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Peng Yu <pengyu.ut <at> gmail.com>, 30681 <at> debbugs.gnu.org
Subject: Re: bug#30681: What characters are in [[:space:]]?
Date: Fri, 2 Mar 2018 14:32:06 -0800

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.

Message #13 received at 30681-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 30681-done <at> debbugs.gnu.org, Peng Yu <pengyu.ut <at> gmail.com>
Subject: Re: bug#30681: What characters are in [[:space:]]?
Date: Fri, 2 Mar 2018 15:19:08 -0800

tags 30681 notabug
stop

On Fri, Mar 2, 2018 at 2:32 PM, Paul Eggert <eggert <at> cs.ucla.edu> 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

Message #16 received at 30681-done <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Jim Meyering <jim <at> meyering.net>
Cc: 30681-done <at> debbugs.gnu.org, Peng Yu <pengyu.ut <at> gmail.com>
Subject: Re: bug#30681: What characters are in [[:space:]]?
Date: Sat, 3 Mar 2018 22:44:29 -0800

Jim Meyering wrote:
> In every one of the 818 locales installed on a Fedora 27 system, I see
> the same five bytes:

Aren't some non-ASCII characters also spaces, in some locales?

Message #19 received at 30681-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 30681-done <at> debbugs.gnu.org, Peng Yu <pengyu.ut <at> gmail.com>
Subject: Re: bug#30681: What characters are in [[:space:]]?
Date: Sun, 4 Mar 2018 02:22:39 -0800

On Sat, Mar 3, 2018 at 10:44 PM, Paul Eggert <eggert <at> cs.ucla.edu> wrote:
> Jim Meyering wrote:
>>
>> In every one of the 818 locales installed on a Fedora 27 system, I see
>> the same five bytes:
>
> Aren't some non-ASCII characters also spaces, in some locales?

Sorry I was unclear.
Those are the single-byte ones.
In multi-byte locales, there are also some others (length two bytes or
more), indeed.

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