CStringで正規表現

// AfxMessageBox
#include <afxwin.h>

// CString
#include <atlstr.h>


#include <string>
#include <regex>

#ifdef _UNICODE
using tregex = std::wregex;
using tmatch = std::wcmatch;
#else
using tregex = std::regex;
using tmatch = std::cmatch;
#endif


int main()
{
    CString text = _T("Hello, 123 こんにちは");

#ifdef _UNICODE
    CString cset= _T(" (UNICODE)");
#else
    CString cset= _T(" (MULTIBYTE)");
#endif

    tregex re(_T("こん.*"));
    tmatch match;
    if (std::regex_search( LPCTSTR(text), match, re))
    {
        int length = (int)(match[0].second - match[0].first);
        CString result(match[0].first, length);
        AfxMessageBox(result + cset);
    }

}