文章目录 find、rfind find、rfind find(正向查找) 正向查抄,会返回要找的子串中第一字符再父串中的下标值 rfind(逆向查找) std::string url = "https://img.bizhizu.com/2015/1231/hskdkfl.jpg"; int begin = url.find('/'); int end = url.rfind("jpg"); std::cout << "begin" << begin << std::endl; std::cout << "end" << end << std::endl; // begin:6 // end:24