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

int main() {
    std::string email = "test@example.com";
    std::regex pattern(R"([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})");

    if (std::regex_match(email, pattern)) {
        std::cout << "邮箱格式正确\n";
    } else {
        std::cout << "邮箱格式错误\n";
    }
    return 0;
}

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

int main() {
    std::string text = "年龄：25，工号：10086，工资：15000";
    std::regex pattern(R"(\d+)");
    std::smatch matches;

    std::string::const_iterator start = text.begin();
    std::string::const_iterator end = text.end();

    while (std::regex_search(start, end, matches, pattern)) {
        std::cout << "找到数字: " << matches[0] << "\n";
        start = matches.suffix().first; // 移动到本次匹配结束位置
    }
    return 0;
}

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

int main() {
    std::string str = "hello    world     C++";
    std::regex pattern(R"( +)");
    std::string result = std::regex_replace(str, pattern, " ");
    std::cout << "处理后: " << result << "\n"; // 输出: hello world C++
    return 0;
}

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

int main() {
    std::string date = "2025-04-05";
    std::regex pattern(R"((\d{4})-(\d{2})-(\d{2}))");
    std::smatch match;

    if (std::regex_match(date, match, pattern)) {
        std::cout << "年: " << match[1] << "\n";
        std::cout << "月: " << match[2] << "\n";
        std::cout << "日: " << match[3] << "\n";
    }
    return 0;
}