AngelScript preprocessor transforming some c++ syntax into AngelScript code

gistfile1.cpp

// Preprocessor.h ----------------------------
#ifndef __INCLUDED_SCRIPTING_ANGELSCRIPT_PREPROCESSING_H
#define __INCLUDED_SCRIPTING_ANGELSCRIPT_PREPROCESSING_H

#include <string>
#include <vector>

class Preprocessor
{
public:
    std::string Preprocess(const std::string &data) const;

    std::vector<std::pair<std::string, std::string> > typedefs;
private:
    template<typename Archive> friend void serialize(Archive & ar, Preprocessor& t, const unsigned int);
};

#endif

// Preprocessor.cpp ----------------------------
#include "Preprocessor.h"
#include <boost/regex.hpp>
#include <boost/foreach.hpp>

std::string Preprocessor::Preprocess(const std::string &data) const
{
    std::string ret;
    boost::regex exp("(\\w+\\s*)\\*(\\s*\\w+\\s*)(;|=|,|\\))");
    ret = boost::regex_replace(data, exp, "\\1@\\2\\3", boost::match_posix);
    exp="->";
    ret = boost::regex_replace(ret, exp, ".");
    exp="^\\s*#include[^\\n]+\\n";
    ret = boost::regex_replace(ret, exp, "");

    std::string be("(\\(|\\s|\\$|,|\\=|\\+|\\-|\\*|/|;|\\))");
    exp = be + "&(\\w+)" + be;
    ret = boost::regex_replace(ret, exp, "\\1\\2\\3");

    typedef std::pair<std::string, std::string> pairtype;
    BOOST_FOREACH(const pairtype & s, typedefs)
    {
        exp = be + s.first + be;
        ret = boost::regex_replace(ret, exp, std::string("\\1") + s.second + "\\2");
    }

    printf("%s\n", ret.c_str());
    return ret;
}