std：：查找不区分大小写的检查

#include <iostream>
#include <algorithm>
#include <cctype>

// 自定义谓词函数，用于比较两个字符是否相等（忽略大小写）
bool caseInsensitiveCharCompare(char c1, char c2) {
    return std::tolower(c1) == std::tolower(c2);
}

int main() {
    std::string str = "Hello, World!";
    std::string target = "world";

    // 使用std::search函数进行不区分大小写的字符串查找
    auto it = std::search(str.begin(), str.end(), target.begin(), target.end(), caseInsensitiveCharCompare);

    if (it != str.end()) {
        std::cout << "Found the target string!" << std::endl;
    } else {
        std::cout << "Target string not found." << std::endl;
    }

    return 0;
}