title: How to parse escape sequences using c++?
body: <p>I have a file with strings: "\x55\u1111 some text\n".
  I saw the same question here: <a href="https://stackoverflow.com/questions/27617903/how-to-parse-a-string-with-raw-escape-sequences">How to parse a string with raw escape sequences?</a> but the solution can't be used in a real application.
  How to parse this string in c++?</p>