C++ TR1 regex - multiline option

I thought that $ indicates the end of string. However, the following
piece of code gives "testbbbccc" as a result, which is quite astonishing
to me... This means that $ actually matches end of line, not end of the
whole string.

#include <iostream>
#include <regex>

using namespace std;

int main()
{
    tr1::regex r("aaa([^]*?)(ogr|$)");
    string test("bbbaaatestbbbccc\nddd");
    vector<int> captures;
    captures.push_back(1);
    const std::tr1::sregex_token_iterator end;
    for (std::tr1::sregex_token_iterator iter(test.begin(), test.end(),
         r, captures); iter != end; )
    {
        string& t1 = iter->str();
        iter++;
        cout << t1;
    }
}

I have been trying to find a "multiline" switch (which actually can be
easily found in PCRE), but without success... Can someone point me to
the right direction?

Regards, R.P.

--
      [ See http://www.gotw.ca/resources/clcm.htm for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]