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

int main()
{
    try {
        std::regex r("[[:alpha:]]*(cie|[^c]ei)[[:alpha:]]*");
        std::string word;
        while(std::cout << "Enter a word or 'q' to quit: ", std::cin >> word)
        {
            if(word == "q") break;

            std::smatch result;

            if(std::regex_search(word, result, r))
            {
                std::cout << "Violate the reule!" << std::endl;
            } else {
                std::cout << word << " is ok!" << std::endl;
            }
        }
    }
    catch (std::regex_error e)
    {
        std::cout << e.what() << std::endl << "Code: " << e.code() << std::endl;
    }

    return 0;
}