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Date: Tue, 14 Mar 2006 11:35:17 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Bug in POSIX.2 regex word boundary matching
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References: <1142317647 DOT 4416624fd617a AT imp1-g19 DOT free DOT fr> <1142318263 DOT 441664b7bea01 AT imp1-g19 DOT free DOT fr>
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On Mar 14 19:37, dominique DOT pelle AT free DOT fr wrote:
> Bleah. #include statements were missing in my
> previously posted sample test case.  Here
> is the test case again with #include statements
> this time:
> 
> $ cat regex-bug.c
> 
> #include <stdio.h>
> #include <regex.h>
> #include <stdlib.h>
> 
> int main()
> {
>   regex_t    r;
>   regmatch_t pmatch[2];
> 
>   if (regcomp(&r, "\\bfoobar\\b", REG_EXTENDED) != 0) {
>     fprintf(stderr, "regcomp failed\n");
>     exit(-1);
>   }
> 
>   /* I'd expect above regex to match following string */
>   if (regexec(&r, "test foobar test", 2, pmatch, 0) == 0) {
>     fprintf(stderr, "OK (match)\n");  /* expected behavior */
>   } else {
>     fprintf(stderr, "FAIL (mismatch)\n"); /* unexpected!? */
>   }
>   return 0;
> }
> 
> $ gcc regex-bug.c
> $ ./a.out
> 
> Outcome on Cywgin ................ FAIL (mismatch)
> 
> Outcome on Linux (Ubuntu-5.10) ... OK (match)

Linux uses the glibc GNU regex library, which allows extensions known
from perl, like \b, \w.  Cygwin's regex is Henry Spencer's implementaton
which does not know these extensions.  Note that the POSIX standard
of regular expressions does not contain these extensions, see also
http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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