Weird regex match behavior. Is my regex wrong? Or is it a compiler error?

I am doing some work using regex in C++, tried both the std::regex and boost:regex (1.58.0).

And I am getting this weird matches. Here is the code:

#include <iostream>
#include <regex>
using namespace std;

int main(int argv, const char* argc[])
{
    regex log_line_regex_(".+\\s(.+)$");
    char* log_line = "06-29 18:20:08.938 1031 1099 D WifiStateMachine: processMsgConnect oo ModeState";
    smatch matches; 
    if (regex_match(std::string(log_line), matches, log_line_regex_))
    {
        std::cout << "match: " << log_line << std::endl;
        unsigned i;
        for (i = 0; i < matches.size(); i++)
        {
            std::cout << "$" << i << ": " << std::string(matches[i].first, matches[i].second) << std::endl;
        }
    }
    return 0;
}

The result is:

match: 06-29 18:20:08.938 1031 1099 D WifiStateMachine: processMsgConnect oo ModeState
$0: 06-29 18:20:08.938 1031 1099 D WifiStateMachine: processMsgConnect oo ModeSt`
$1: ModeSt`

See? The output is mangled :( As I said I tried with boost 1.58.0 and g++ (GCC) 4.9.2 both on Cygwin

Compiled at Ideone also fails

I find it weird that boost::regex fails at this simple regex. So is my usage wrong?