26   assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),  in main()
30   assert(std::regex_match(str1_scnd, std::regex("a"),  in main()
35   assert(std::regex_search(str1, std::regex("\\ba")));  in main()
36   assert(std::regex_match(str1 + 1, str1 + 2, std::regex("\\ba\\b"),  in main()
39   assert(std::regex_search(str1_scnd, std::regex("\\ba"),  in main()
44   assert(std::regex_match(str1 + 1, str1 + 2, std::regex("^a"),  in main()
48   assert(std::regex_match(str1_scnd, std::regex("\\ba"),  in main()
57   assert(std::regex_search(Start, End, std::regex("^cd")));  in main()
59   assert(!std::regex_search(Start, End, std::regex("^cd"),  in main()
61   assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),  in main()
63   assert(!std::regex_search(Start, End, std::regex("^cd"),  in main()
66   assert(!std::regex_search(Start, End, std::regex(".*\\bcd\\b"),  in main()
70   assert(std::regex_search(Start, End, std::regex("^cd"),  in main()
73   assert(std::regex_search(Start, End, std::regex("^cd"),  in main()
76   assert(std::regex_search(Start, End, std::regex("^cd"),  in main()
79   assert(std::regex_match(Start, End, std::regex("\\bcd\\b"),  in main()