lst-0017-book.cpp
// https://godbolt.org/z/TK6n4dG37
const string scoreKeyword = R"(^score\s+)";
const string numberOfPoints = R"((\d+))";
const string forKeyword = R"(\s+for\s+)";
const string numberOfNights = R"((\d+))";
const string nightsAtKeyword = R"(\s+nights?\s+at\s+)";
const string hotelName = R"((.*))";
const regex pattern{ scoreKeyword + numberOfPoints +
forKeyword + numberOfNights + nightsAtKeyword + hotelName };
}