regexblog8

regexblog8.scala

    def listToConcat(list: List[RegexExpr]): RegexExpr = list match {
        case head :: Nil => head
        case head :: rest => Concat(head, listToConcat(rest))
    }

    def apply(input: String): Option[RegexExpr] = {
        parseAll(highExpr, input) match {
            case Success(result, _) => Some(result)
            case failure : NoSuccess => None
        }
    }
}