[pcre-dev] PCRE head-scratcher

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Author: Wade Williams
Date:  
To: pcre-dev
Subject: [pcre-dev] PCRE head-scratcher
Hi,

Sorry for emailing the developers with this, but I didn't see a
general pcre-users mailing list.

I've got one that's got me scratching my head, though I'm sure I'm
missing something simple.

I'm trying to search the subject "[VOR]" for the expression "\[VOR\]".

It works using pcredemo, but I can't get it to work in my code.

Here it is in pcredemo:

rtp-wwilliam-vpn12:pcre-7.5 wwilliam$ ./pcredemo "\[VOR\]" "[VOR]"

Match succeeded at offset 0
0: [VOR]

But when run from code, all I get is 1 and 2 in the first ovector
element, giving "[".

>     pcre *c_regex = NULL;
>     const char *errptr;
>     int    erroffset, errorcodeptr,  *ovector = NULL, num_substrings = 0,  
> ret = 0, pcre_options = 0, len=0, num_elements = 0;

>
>         c_regex = pcre_compile2("\[VOR\]", pcre_options | PCRE_NEWLINE_ANY,
>             &errorcodeptr,
>             &errptr, &erroffset, NULL);

>             
>         ret = pcre_fullinfo( c_regex, NULL, PCRE_INFO_CAPTURECOUNT,  
> &num_substrings );

>                 
>                 //allocate the amount of memory needed to store our vectors  
> ( num captured substrings + 1 * 3) -- see pcre documention on  
> pcre_exec for details
>         num_elements = ( num_substrings + 1 ) * 3;
>         ovector = (int *) malloc(sizeof(int) * num_elements);

>         
>         char subject[] = "[VOR]";

>         
>         len = strlen(subject);

>         
>         ret = pcre_exec(c_regex, NULL, subject, len, 0, 0, ovector,  
> num_elements);

>



> Running…
> (gdb) p ovector[0]
> $1 = 1
> (gdb) p ovector[1]
> $2 = 2
> (gdb) p ovector[2]
> $3 = 0
> (gdb) p ovector[3]
> $4 = 0
>


What incredibly stupid mistake am I missing?

Thanks,

Wade