Scala regex m,ed navngivne gruops

package models

/**
 * Created by Jacob on 31-03-2015.
 */
object main {
   def main(args: Array[String]) {
      val KilosOrGrams = """(\d+(\.\d+)?)\s*(g|kg)?""".r
      val source1 = "2500 g"
      val source2 = "3.7kg"

      def find(s: String): (Double, String) = {
         s match {
            case KilosOrGrams(number, decimal, unit) => Pair(number.toDouble, unit)
            case _ => Pair(0, "")
         }
      }
      println(find(source1))
      println(find(source2))
   }
}