docs: public static String parseEchoStatement(String statement)
      {
          Matcher matcher = EchoToken.matcher(statement);
          if (matcher.matches()) {
              String commandWordTerminator = matcher.group(1);
              if (OneWhitespace.matcher(commandWordTerminator).matches()) {
                  return matcher.group(2);
              }
              return "";
          }
          return null;
      }