Source that is used for Injectors and Extractros in Scala blog post

Firstname.scala

case class Firstname(name:String)

Injector.scala

object IPAddress {

  def apply(a:String, b:String, c:String, d:String):String = a + "." + b + "." + c + "." + d

  def unapply(ip:String):Option[(String, String, String, String)] = {
    ...
  }

}

IPAddress.scala

object IPAddress {

  def unapply(ip:String):Option[(String, String, String, String)] = {
    val tokens = ip split "\\."
    if (tokens.length == 4 && isValid(tokens)) Some(tokens(0), tokens(1), tokens(2), tokens(3)) else None
  }

  private def isValid (tokens:Array[String]):Boolean = {
    tokens forall { elem =>
      try {
        val intValue = elem.toInt
        intValue >= 0 && intValue <= 255
      } catch {
        case _ => false
      }
    }
  }

}

IPAddresses.scala

object IPAddresses {
  def unapplySeq(ips:String):Option[Seq[String]] = {
    Some(ips split ",")
  }
}

NoBinding.scala

def unapply(ip:String):Boolean = {
  val tokens = ip split "\\."
  if (tokens.length == 4 && isValid(tokens)) true else false
}