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

int main()
{
    std::string s = "Some `people`, when confronted with a problem, think "
        "\"I know, I'll use regular `expressions`.\" "
        "Now they have two problems.";

    std::regex word_regex("`(\\w+)`");
    auto words_begin =
        std::sregex_iterator(s.begin(), s.end(), word_regex);
    auto words_end = std::sregex_iterator();
    for (std::sregex_iterator i = words_begin; i != words_end; ++i) {
            std::cout << "  " <<(*i).str() << '\n';
    }
}