#include <iostream>
#include <string>
#include <regex>

using namespace std;

void testRegx() {
    regex regx("h(.+?)llo",regex::icase);
    string str = "hello world!hollo world....hallo1  heello2";

    bool remr = regex_match(str, regx);//regex_match全字串匹配
    if (remr) {
        cout
 
 << "matched" << endl;
    }else {
        cout << "not matched" << endl;
    }

    smatch mch;
    string newStr = str;
    while (regex_search(newStr, mch, regx)) {//regex_search查詢子字串
        cout << "searched:" << mch.str() << endl;
        newStr = mch.suffix().str();
    }

    std
 
::cout << std::regex_replace(str, regx, "hi-$1") << endl;;//替換子字串
    cout << str << endl;
}
int main()
{
    testRegx();
    return 0;
}

輸出結果：

not matched
searched:hello
searched:hollo
searched:hallo
searched:heello
hi-e world!hi-o world....hi-a1  hi-ee2
hello world!hollo world...
 
.hallo1  heello2
請按任意鍵繼續. . .