(/~\/+|\/+$/g, '')

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

int main() {
    std::string input = "/~\\/+/|\\/+$/g";
    std::regex pattern("/~\\/+/|\\/+$/g");
    std::string result = std::regex_replace(input, pattern, "");

    std::cout << result << std::endl;

    return 0;
}

Explanation:

1. #include <iostream>: Includes the input/output stream library.
2. #include <regex>: Includes the regular expression library.
3. #include <string>: Includes the string library.
4. int main() {: Beginning of the main function.
5. std::string input = "/~\\/+/|\\/+$/g";: Declares a string variable named input and assigns the value "/~\/+/|\/+$/g" to it. The backslashes are escaped to represent special characters.
6. std::regex pattern("/~\\/+/|\\/+$/g");: Declares a regular expression pattern stored in the variable pattern. The pattern "/~\/+/|\/+$/g" is used to match a sequence of characters.
7. std::string result = std::regex_replace(input, pattern, "");: Uses std::regex_replace function to replace all matches of the regular expression pattern in the input string with an empty string, storing the result in the variable result.
8. std::cout << result << std::endl;: Outputs the value of result to the console.
9. return 0;: Indicates successful execution and termination of the main() function.