getEncoding.scala

def getEncoding(text: String): Option[String] = {
    def checkEncoding(encoding: String): Boolean = {
        try{
            text == new String(text.getBytes(encoding), encoding)
        }catch{
            case NonFatal(_)   => false
            case th: Throtable  => throw th
        }
    }
    List("ascii", "iso-2022-jp", "utf-8", "euc-jp", "sjis", "utf-16")
        .par
        .find(checkEncoding(_))
}