[pcre-dev] regexp does not work , but does work on others

im new to pcre , im trying to embed the engine into my application but
i have problem to
run regexp that capture the link out of href .
this is my regexp :
char *regex = "<a[^>]+href\s*=\s*[\"']?([^\"'> ]+)";
and this is my string data :
char *data  = "<a href=\"index.html\">PCRE index page</a>";
please note that this regexp is vaild and working you can check it
here : http://www.gskinner.com/RegExr/
here is my sample code :
#include <stdio.h>  //meat and potatoes
#include <string.h>
#include <pcre.h>
#define OVECCOUNT 30    /* should be a multiple of 3 */
int main(int argc, char* argv[])
{
pcre *re;
const char *error;
int erroffset;
int ovector[OVECCOUNT];
int rc;
char *regex = "<a[^>]+href\s*=\s*[\"']?([^\"'> ]+)";
char *data  = "<a href=\"index.html\">PCRE index page</a>"; re = pcre_compile(
                regex,   /* the pattern */
                0,   /* default options */
                &error,   /* for error message */
                &erroffset,        /* for error offset */
                NULL);             /* use default character table */
if (! re)
{
    fprintf(stderr, "PCRE compilation failed at expression offset %d:
%s\n", erroffset, error);
    return 1;
}

rc = pcre_exec(
                re,             /* the compiled pattern */
                NULL,       /* no extra data - we didn't study the pattern */
                data,    /* the subject string */
                strlen(data),   /* the length of the subject */
                0,              /* start at offset 0 in the subject */
                0,             /* default options */
                ovector,       /* output vector for substring information */
                OVECCOUNT);    /* number of elements in the outputvector */
if (rc < 0)
{
    switch(rc)
    {
        case PCRE_ERROR_NOMATCH:
        printf("No match found in text\n");
        break;
    /*
        More cases defined...
    */
        default:
        printf("Match error %d\n", rc);
        break;
         return 1;
    }
}
if (rc < 3)
{
    printf("Match did not catch all the groups\n");
    return 1;
}
/*ovector[0]..ovector[1] are the entire matched string*/
char *name_start = data + ovector[2]; int name_length = ovector[3] -
ovector[2]; char *domain_start = data + ovector[4]; int domain_length
= ovector[5] - ovector[4];
/* Finally, print the match */
  printf("Mail from: %.*s domain: %.*s\n",
  name_length, name_start,
  domain_length, domain_start);
  return 0;
} //END main