C++ Linux中如何使用正则表达式

<code class="c++">#include <iostream>
#include <string>
#include <regex>

int main() {
    // 正则表达式模式
    std::string pattern = R"(\d+)"; // 匹配一个或多个数字

    // 待匹配文本
    std::string text = "Hello, there are 123 apples and 456 oranges.";

    // 创建正则表达式对象
    std::regex regex(pattern);

    // 使用std::sregex_iterator迭代匹配结果
    auto words_begin = std::sregex_iterator(text.begin(), text.end(), regex);
    auto words_end = std::sregex_iterator();

    int count = 0;
    for (auto it = words_begin; it != words_end; ++it) {
        std::smatch match = *it;
        std::cout << "Found number: " << match.str() << std::endl;
        count++;
    }

    std::cout << "Found " << count << " numbers in the text." << std::endl;

    return 0;
}</code>

<code class="bash">g++ -std=c++11 -o regex_example regex_example.cpp
./regex_example</code>

<code>Found number: 123
Found number: 456
Found 2 numbers in the text.</code>