Performing RegEx on open file

Hi, like the title says, I'm trying to open a file and perform a regex on it, then print the matches, but I'm not sure if I have it right. I think I need to remove the line -

Code:

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[for ( std::vector<TCHAR>::iterator It = buffer.begin();It != buffer.end(); It++ )

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since I've already copied the file into the buffer, but how do I search the buffer?

Code:

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std::ifstream in(TempFullPath, std::ios::in|std::ios::binary);

if( in.fail() )
{
        std::cout << "File does not exist or could not open file";
}


std::vector<TCHAR> buffer;
std::copy(
                std::istreambuf_iterator<TCHAR>( in ),
                std::istreambuf_iterator<TCHAR>(),
                std::back_inserter( buffer )
                );
for ( std::vector<TCHAR>::iterator It = buffer.begin();It != buffer.end(); It++ ) {
        sbuf = (*It);
        if( boost::regex_search(sbuf , matches, re ) )
                        {
                                std::string value( matches[1].first, matches[1].second );
                                StringCchCat(TextAreaBuffer, MAX_PATH, value.c_str());
                                StringCchCat(TextAreaBuffer, MAX_PATH, TEXT("\r\n"));
                                int ndx = GetWindowTextLength (textArea);
                                SetFocus (textArea);
                                #ifdef WIN32
                                        SendMessage (textArea, EM_SETSEL, (WPARAM)ndx, (LPARAM)ndx);
                                #else
                                        SendMessage (textArea, EM_SETSEL, 0, MAKELONG (ndx, ndx));
                                #endif
                                        SendMessage (textArea, EM_REPLACESEL, 0, (LPARAM) (TextAreaBuffer));
                                               
                }
}

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I found a better way of how to open a file. But I need help trying to match a url using boost::xpressive. I got the following off the web that doesn't match anything, other examples I tried throw a compile error. Does anyone know of a boost compatible regex to match a URI? I tried to match using this but I'm not sure if I'm escaping correctly -

Code:

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sregex::compile("(\?:ftp\|https\?:\/\/)\+(\?:\\S+\.)\+(\?:\\S\.)\+(\?:\S)\+");

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