#include <boost/regex.hpp>
#include <xstring>
#include <fstream>

int main(int argc, char* argv[])
{
	try
	{
		std::string in, line;
		std::ifstream f("c:\\input.txt");
		while (getline(f, line)) 
			in += line + '\n'; 

		std::string exprStr("(\\w+\\()((?!System)*)System\\.Data\\.DataSet (\\w+)([,)].*)\\3([,}].*)Begin\\1\\2System\\.Data\\.DataSet \\3([,)].*)\\3([,}].*)End\\1");
		std::string replStr("$1$2System.Data.DataSet $3$4Helper.ConvertFromDateTime\\($3.Copy\\(\\)\\)$5Begin$1$2System.Data.DataSet $3$6Helper.ConvertFromDateTime\\($3.Copy\\(\\)\\)$7End$1");

		boost::regex expr(exprStr, boost::regbase::normal | boost::regbase::icase);	
		std::string out(boost::regex_merge(in, expr, replStr));

		std::ofstream fout("c:\\output.txt");
		fout << out; 
	}
	catch (const std::exception& e)
	{
		printf("%s", e.what());
	}

	return 0;
}