#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
  const char* s = "sip:012345678@11.111.11.111:5060;user=phone";
  const char* re = "^\\([[:alpha:]][[:alnum:]]\\+:\\)\\?/\\?/\\?\\([^[:space:][:cntrl:]@]\\+@\\)\\?\\([[:alnum:]._+-]\\+\\|[[][[:xdigit:].:]\\+[]]\\)\\(:[0-9]\\+\\)\\?";

  regex_t* data = (regex_t*)malloc(sizeof(regex_t));
  regcomp(data, re, 0);

  const int MAX_MATCH = 9;
  regmatch_t rmatch[MAX_MATCH];
  regexec(data, s, MAX_MATCH, rmatch, 0);

  for (int i = 0; i < MAX_MATCH; i++) {
    char substr[256];
    unsigned substr_len = rmatch[i].rm_eo - rmatch[i].rm_so;
    memcpy(substr, s + rmatch[i].rm_so, substr_len);
    substr[substr_len] = '\0';
    printf("Match %u: %2d - %2d \t%s\n",
           i, rmatch[i].rm_so, rmatch[i].rm_eo,
           substr_len > 0? substr : "");
  }

  return 0;
}


/*
glibc:

Match 0:  0 - 32        sip:012345678@11.111.11.111:5060
Match 1:  0 -  4        sip:
Match 2:  4 - 14        012345678@
Match 3: 14 - 27        11.111.11.111
Match 4: 27 - 32        :5060
Match 5: -1 - -1
Match 6: -1 - -1
Match 7: -1 - -1
Match 8: -1 - -1


musl 1.1.19:
Match 0:  0 - 32        sip:012345678@11.111.11.111:5060
Match 1: -1 - -1
Match 2:  0 - 14        sip:012345678@
Match 3: 14 - 27        11.111.11.111
Match 4: 27 - 32        :5060
Match 5: -1 - -1
Match 6: -1 - -1
Match 7: -1 - -1
Match 8: -1 - -1

*/