27         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
28         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()
34         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
35         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()
42         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
43         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()
50         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
51         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()
58         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
59         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()
66         std::string phone_book("555-1234, 555-2345, 555-3456");  in main()  local
67         std::string r = std::regex_replace(phone_book, phone_numbers,  in main()