#include <pcreposix.h>
#include <stdio.h>

int main()
{
    regex_t rx;
    char *pat = "(?:([0-2]?\\d{1,2})\\.){3}([0-2]?\\d{1,2})";
    char *str = "123.45.67.89";
    regmatch_t match [6];
    int i;
    
    regcomp (&rx, pat, 0);
    regexec (&rx, str, 6, match, 0);
    
    for (i=0; i<6; i++)
    {
	printf ("RX matched from %i to %i\n", match[i].rm_so, match[i].rm_eo);
    }

    return 0;
}