Search by text , replace by regular expression results in a crash

Question

I am using boost::xpressive::regex_search to perform search and replace of string by either text or regular expression . Following is my code which crashes in the regex_replace function

#include <iostream>
#include <boost/xpressive/xpressive.hpp>
using namespace boost::xpressive;
#include <iostream>
#include <algorithm>

int _tmain(int argc, _TCHAR* argv[])
{

    std::wstring wsObjectName(L"tweet");
    std::wstring pStr = wsObjectName;
    std::wstring wEsc = pStr;


    std::wstring wReplaceByText(L"\\*\\*\\g<char>\\*\\*");
    std::wstring searchText(L"tweet");

    wsregex regExp;
    try
    {
        regExp = wsregex::compile( searchText );
    }
    catch ( regex_error &/*error*/ )
    {
        throw ;
    }
    catch (...)
    {
        throw ;
    }

    std::wstring wReplaceByText1 ;
    std::wstring ws = boost::xpressive::regex_replace( wEsc, regExp, wReplaceByText,   regex_constants::format_perl | regex_constants::match_not_null );


    wcout<<ws;
    return 0;
}