#include <error.h>

#include <sys/types.h>

#include <regex.h>

#include <stdio.h>

#include <stdlib.h>

int

main (void)

{

  regex_t re;

  regmatch_t ma[2];

  int reerr;

  int res = 0;

  re_set_syntax (RE_DEBUG);

  reerr = regcomp (&re, "0*[0-9][0-9]", 0);

  if (reerr != 0)

    {

      char buf[100];

      regerror (reerr, &re, buf, sizeof buf);

      error (EXIT_FAILURE, 0, "%s", buf);

    }

  if (regexec (&re, "002", 2, ma, 0) != 0)

    {

      error (0, 0, "\"0*[0-9][0-9]\" does not match \"002\"");

      res = 1;

    }

  puts ("Succesful match with \"0*[0-9][0-9]\"");

  regfree (&re);

  reerr = regcomp (&re, "[0a]*[0-9][0-9]", 0);

  if (reerr != 0)

    {

      char buf[100];

      regerror (reerr, &re, buf, sizeof buf);

      error (EXIT_FAILURE, 0, "%s", buf);

    }

  if (regexec (&re, "002", 2, ma, 0) != 0)

    {

      error (0, 0, "\"[0a]*[0-9][0-9]\" does not match \"002\"");

      res = 1;

    }

  puts ("Succesful match with \"[0a]*[0-9][0-9]\"");

  regfree (&re);

  return res;

}