bug#51669: closed (some patterns which should match 0x0 don’t do so)

[GNU bug Tracking System]

Your message dated Sun, 7 Nov 2021 16:37:17 -0800
with message-id <1158bc7b-f8d4-e692-1af0-1767edf7b630@cs.ucla.edu>
and subject line Re: bug#51669: some patterns which should match 0x0 don’t do so
has caused the debbugs.gnu.org bug report #51669,
regarding some patterns which should match 0x0 don’t do so
to be marked as done.

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-- 
51669: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=51669
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> --- Begin Message ---
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> Subject: 
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> some patterns which should match 0x0 don’t do so
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> Date: 
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> Sun, 07 Nov 2021 17:56:56 +0100
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> User-agent: 
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> Evolution 3.42.0-2 
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>
>
>
> Hey.
>
> Maybe this is no a bug at all due grep rather being focused on text
> files and 0x0 being special anyway, but just for your information:
>
>
>
> $ hd test-with-0x00-and-0x02 
> 00000000  66 6f 6f 0a 62 61 72 0a  7a 65 02 00 0a 62 61 7a  |foo.bar.ze...baz|
> 00000010  0a 7a 65 72 00 0a 65 6e  64 0a                    |.zer..end.|
> 0000001a
>
> If one now does:
> $ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-and-0x02
> grep: test-with-0x00-and-0x02: binary file matches
>
> it matches, presumably only the 0x02, though.
>
>
> Having only 0x00 in the file:
> $ hd test-with-0x00-only
> 00000000  66 6f 6f 0a 62 61 72 0a  7a 65 72 00 0a 62 61 7a  |foo.bar.zer..baz|
> 00000010  0a 7a 65 72 00 0a 65 6e  64 0a                    |.zer..end.|
> 0000001a
>
> doesn’t cause a match:
> $ grep '[^[:alnum:][:space:][:punct:]]' test-with-0x00-only
> $
>
> while naively I'd have assume that 0x00 should be matched as well.
>
>
> Cheers,
> Chris.
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
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> Re: bug#51669: some patterns which should match 0x0 don’t do so
>
>
>
>
> Date: 
>
> Sun, 7 Nov 2021 16:37:17 -0800
>
>
>
>
> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1
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>
>
>
> That's a feature not a bug; see:
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> https://www.gnu.org/software/grep/manual/html_node/File-and-Directory-Selection.html
>
> and look for --binary-files. You can use 'grep -a' to pay more attention 
> to binary data.
>
>
> --- End Message ---