How can I replace a substring in a string using C++17?

How can I replace a substring in a string using C++17?

You can use the std::string::replace method along with std::string::find to replace substrings in C++17.

Can you show me a code example?

Sure! Here's a simple example:

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello, World!";
    std::string toReplace = "World";
    std::string replaceWith = "C++17";

    size_t pos = str.find(toReplace);
    if (pos != std::string::npos) {
        str.replace(pos, toReplace.length(), replaceWith);
    }

    std::cout << str << std::endl; // Outputs: Hello, C++17!
    return 0;
}

What if the substring appears multiple times?

You can use a loop to find and replace all occurrences. Here's an updated example:

#include <iostream>
#include <string>

int main() {
    std::string str = "Hello, World! World!";
    std::string toReplace = "World";
    std::string replaceWith = "C++17";

    size_t pos = 0;
    while ((pos = str.find(toReplace, pos)) != std::string::npos) {
        str.replace(pos, toReplace.length(), replaceWith);
        pos += replaceWith.length(); // Move past the last replaced substring
    }

    std::cout << str << std::endl; // Outputs: Hello, C++17! C++17!
    return 0;
}