直接上程式碼，YFile只不過是對fstream的封裝

#include <iostream>
#include <string>
#include <regex>
using namespace std;
string ReadFileData(const string &strFile);

string RegReplace(const string &data, const string &strKey, const string &strValue);

void WriteFileData(const string
 
 &strFile, const string &strData);

void string_replace(std::string &strBig, const std::string &strsrc, const std::string &strdst)
{
    std::string::size_type pos = 0;
    std::string::size_type srclen = strsrc.size();
    std::string::size_type dstlen = strdst.size();

    while
 
 ((pos = strBig.find(strsrc, pos)) != std::string::npos)
    {
        strBig.replace(pos, srclen, strdst);
        pos += dstlen;
    }
}


/*
    argv[0]
    argv[1] File location
    argv[2] regexp
    argv[3] the stuff u need to replace
*/
int main(int argc,char *argv[])
{
    string data = ReadFileData(argv[1
 
]);
    if (data.empty())
    {
        cout << "ReadFileData Error!" << endl;
        return -1;
    }

    data = RegReplace(data, argv[2], argv[3]);
    if (data.empty())
    {
        cout << "RegReplace Error!" << endl;
        return -1;
    }


    WriteFileData(argv[1],data);
    return 0;
}

string ReadFileData(const string &strFile)
{
    YFile file(strFile.c_str());
    file.Open(READONLY);
    auto strData = file.ReadAll();
    file.Close();

    return strData;
}

string RegReplace(const string &data,const string &strKey, const string &strValue)
{
    string strKey2 = strKey;
    string strResult;
    regex reg(strKey2);
    smatch result;
    if (!regex_search(data, reg))
    {
        return "";
    }


    strResult = regex_replace(data, reg, strValue);
    if(strResult.empty())
    {
        return "";
    }
    return strResult;
}



void WriteFileData(const string &strFile,const string &strData)
{
    YFile file(strFile.c_str());
    file.Open(WRITEONLY);
    file.Write(strData.c_str());
    file.Close();
}