c++中如何实现字符串替换_c++字符串替换方法

#include <string>
#include <iostream>

std::string& replaceOnce(std::string& str, const std::string& from, const std::string& to) {
    size_t pos = str.find(from);
    if (pos != std::string::npos) {
        str.replace(pos, from.length(), to);
    }
    return str;
}

std::string text = "Hello world!";
replaceOnce(text, "world", "C++");
std::cout << text << std::endl; // 输出: Hello C++!

std::string& replaceAll(std::string& str, const std::string& from, const std::string& to) {
    if (from.empty()) return str;
    size_t pos = 0;
    while ((pos = str.find(from, pos)) != std::string::npos) {
        str.replace(pos, from.length(), to);
        pos += to.length(); // 跳过已替换部分，防止死循环
    }
    return str;
}

std::string text = "apple banana apple";
replaceAll(text, "apple", "orange");
std::cout << text << std::endl; // 输出: orange banana orange

#include <boost/algorithm/string.hpp>

std::string text = "hello hello hello";
boost::algorithm::replace_all(text, "hello", "hi");