[debbugs-tracker] bug#25336: closed ()

[GNU bug Tracking System]

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25336: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25336
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--- Begin Message --- Subject: Date: Mon, 2 Jan 2017 21:22:59 +0800

OS: Archlinux

grep version: 2.27-1

Bug description: grep behaves weirdly when searching hex values.

How to reproduce:

$ printf '\x53\xef' | grep -aoP '\x53\xef'

(no output, returns 1)

$ printf '\x53\xc3\xaf' | grep -aoP '\x53\xef'

Sï

$ printf '\x53\xc3\xef' | grep -aoP '\x53\xef'

(no output, returns 1)

grep (version 2.12-2) provided by Debian works just fine.

--- End Message ---

> --- Begin Message ---
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> Subject: 
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> Re: bug#25336:
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> Date: 
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> Mon, 2 Jan 2017 10:30:32 -0800
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> User-agent: 
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> Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1
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>
> Zepp Lu wrote:
>
> > $ printf '\x53\xef' | grep -aoP '\x53\xef'
> > (no output, returns 1)
> > $ printf '\x53\xc3\xaf' | grep -aoP '\x53\xef'
> > Sï
> > $ printf '\x53\xc3\xef' | grep -aoP '\x53\xef'
> > (no output, returns 1)
>
> I don't see a bug here. PCRE patterns like \xef match code points, not bytes, so 
> the PCRE notation differs from the shell printf notation. If your locale uses 
> UTF-8, the PCRE pattern \xef matches the Unicode character U+00EF LATIN SMALL 
> LETTER I WITH DIAERESIS, which is represented by the byte pair C3 AF.
>
> If you want \xef to match a single byte, run grep in a single-byte locale, e.g., 
> set LC_ALL=C in the environment.
>
> > grep (version 2.12-2) provided by Debian works just fine.
>
> Actually, it's buggy in this area. Sometimes it can dump core.
>
>
> --- End Message ---