operator<< (std::sub_match)

将匹配子序列 m 的表示形式写入输出流 os 。 等价于 os << m. str ( ) 。

参数

返回值

os

示例

#include <iostream>
#include <regex>
#include <string>
int main()
{
    std::string sentence{"Quick red fox jumped over a lazy hare."};
    const std::regex re{"([A-z]+) ([a-z]+) ([a-z]+)"};
    std::smatch words;
    std::regex_search(sentence, words, re);
    for (const auto& m : words)
        // m has type `const std::sub_match<std::string::const_iterator>&`
        std::cout << '[' << m << "] ";
    std::cout << '\n';
}

[Quick red fox] [Quick] [red] [fox]