C++ regex_match not working

Here is part of my code

bool CSettings::bParseLine ( const char* input )
{
    //_asm INT 3


    std::string line ( input );
    std::size_t position = std::string::npos, comment;

    regex cvarPattern ( "\\.([a-zA-Z_]+)" );
    regex parentPattern ( "^([a-zA-Z0-9_]+)\\." );
    regex cvarValue ( "\\.[a-zA-Z0-9_]+[ ]*=[ ]*(\\d+\\.*\\d*)" );
    std::cmatch matchedParent, matchedCvar;


    if ( line.empty ( ) )
        return false;

    if ( !std::regex_match ( line.c_str ( ), matchedParent, parentPattern ) )
        return false;

    if ( !std::regex_match ( line.c_str ( ), matchedCvar, cvarPattern ) )
        return false;
...
}

I try to separate with it lines which I read from file - lines look like:

foo.bar = 15
baz.asd = 13
ddd.dgh = 66

and I want to extract parts from it - e.g. for 1st line foo.bar = 15, I want to end up with something like:

a = foo
b = bar
c = 15

but now, regex is returning always false, I tested it on many online regex checkers, and even in visual studio, and it's working great, do I need some different syntax for C++ regex_match? I'm using visual studio 2013 community