C++:
रेगुलर एक्सप्रेशन्स का उपयोग करना

#include <iostream>
#include <regex>

int main() {
    std::string target = "Hello, my email is [email protected]";
    std::regex email_pattern(R"(\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}\b)");

    if (std::regex_search(target, email_pattern)) {
        std::cout << "Email found!" << std::endl;
    } else {
        std::cout << "No email found." << std::endl;
    }

    return 0;
}

#include <iostream>
#include <regex>

int main() {
    std::string text = "The rain in Spain falls mainly in the plain.";
    std::regex vowel_regex("([aeiou])");

    std::string replaced_text = std::regex_replace(text, vowel_regex, "*");
    std::cout << replaced_text << std::endl;

    return 0;
}

#include <iostream>
#include <boost/regex.hpp>

int main() {
    std::string s = "Boost libraries are fun!";
    boost::regex expr("(\\w+)\\s(libraries)"); // "Boost libraries" से मिलान
    std::string fmt("GNU \\1"); // "GNU Boost" से बदलें

    std::string result = boost::regex_replace(s, expr, fmt);
    std::cout << result << std::endl;

    return 0;
}