Extractors for numbers in strings

gistfile1.scala

  object f {
    val floatingPointNumberPattern = """(\d+(?:[.]\d*))""".r
    def unapply(s: String): Option[Double] = s match {
      case floatingPointNumberPattern(x) ⇒ Some(x.toDouble)
      case _ ⇒ None
    }
  }

  object i {
    val nonNegativeIntegerPattern = """(\d+)""".r
    def unapply(s: String): Option[Int] = s match {
      case nonNegativeIntegerPattern(x) ⇒ Some(x.toInt)
      case _ ⇒ None
    }
  }