(
    regex("\\b(true|false)\\b".r)                                                                                              ^^ { BooleanLit(_) }
    |regex("[0-9]+((((\\.)?)[0-9]*(E|e)((\\+|-)?)[0-9]+)|(\\.[0-9]*))".r)                                                      ^^ { FloatLit(_) }
      |regex("[_A-Za-z][_A-Za-z0-9]*".r)                                                                                                                     ^^ { processIdent(_) }
      |regex("[0-9]+".r)                                                                                                         ^^ { IntLit(_) }
      |regex("\"((\\\\\\\\)|(\\\\b)|(\\\\t)|(\\\\f)|(\\\\r)|(\\\\n)|(\\\\\")|([^((\\n)|(\\t)|(\")|(\\\\))]))*\"".r)              ^^ { case str => StringLit(str.slice(1, str.size-1)) }
    |regex("\"((\\t)|(\\\\\\\\)|(\\\\b)|(\\\\t)|(\\\\f)|(\\\\r)|(\\\\n)|(\\\\\")|([^((\\n)|(\")|(\\\\))]))+\"".r)              ^^ { case str => ErrorToken("Illegal tab in string: " + str.split("\\t")(0)) }
    |regex("\"(([^((\\n)|(\\t)|(\")|(\\\\))])|(\\\\\\\\)|(\\\\b)|(\\\\t)|(\\\\f)|(\\\\r)|(\\\\n)|(\\\\\"))*".r)                ^^ { case str => ErrorToken("Unclosed string: " + str) }
    |EofCh                                                                                                                     ^^^ EOF
    |delim
    )