regex("[a-zA-Z_][a-zA-Z0-9_]*".r)       ^^ {processIdent(_)}
                            |regex("([0-9]+\\.[0-9]*((E|e)(\\+|-)?[0-9]+)?)|([0-9]+(E|e)(\\+|-)?[0-9]+)".r) ^^ {FloatLit(_)}
                            |regex("[0-9]+".r)          ^^ { IntLit(_) }
                            |regex("\"([^\\n\\\\\"]|(\\\\b)|(\\\\f)|(\\\\r)|(\\\\n)|(\\\\t)|(\\\\\")|(\\\\\\\\))*\"".r) ^^ {Stringlit(_)}
                            |regex("\"([^\\n\\\\\"]|(\\\\b)|(\\\\f)|(\\\\r)|(\\\\n)|(\\\\t)|(\\\\\")|(\\\\\\\\))*".r) ^^ {UnclosedString(_)}
                            |EofCh                      ^^^ EOF
                            |delim
                            )