Google re2 namedcapture, how to parse results in c  ?
bool b_matches ;
string s_teststr = " aaaaa flickr bbbb";
RE2 re("(?P<flickr>flickr)|(?P<flixster>flixster)");
assert(re.ok()); // compiled; if not, see re.error();
b_matches = RE2::FullMatch(s_teststr, re);

  b_matches = RE2::FullMatch(s_teststr, re);

// then,
re.NumberOfCapturingGroups() //-> always give me 2

 re.CapturingGroupNames(); //-> give me a map with id -> name (with 2 elements)

re.NamedCapturingGroups() //-> give me a map with name -> id (with 2 elements)

string s_teststr = "aaa  hello. crazy world bbb";
std::string word[margc];
RE2::Arg margv[margc];
RE2::Arg * margs[margc];
int match;
int i;

    for (i = 0; i < margc; i++) {
        margv[i] = &word[i];
        margs[i] = &margv[i];
    }
   string s_rematch = "((?P<a>hello\.)(.*)(world))|(world)";
  match = RE2::PartialMatchN(s_teststr.c_str(), s_rematch.c_str(), margs, margc);
cout << "found res = " << match << endl;
  for (int i = 0; i < margc; i++) {
        cout << "arg[" << i << "] = " << word[i] << endl;
    }

string s_rematch = "((?P<a>hello\.d)(.*)(world))|(world)";

std::string matchedValue;

if (RE2::FullMatch(s_teststr, re, &matchedValue))
{
    if (matchedValue.emtpy())
    {
        //not flickr
    }
}
else
{
    //matchedValue.empty() == true
}