No case in regex!

Day2.scala

@@ -14,12 +14,11 @@ case class Game(id: Int, hands: List[Hand]):
 object Parser extends RegexParsers:
   val num = """(0|[1-9]\d*)""".r ^^ { _.toInt }
   val update =
-    num ~ """(red|green|blue)""".r ^^ { case (num ~ color) =>
-      color match
-        case "red"   => (h: Hand) => h.copy(red = num)
-        case "green" => (h: Hand) => h.copy(green = num)
-        case "blue"  => (h: Hand) => h.copy(blue = num)
-    }
+    num ~ (
+      "red" ^^ (_ => (num: Int) => (h: Hand) => h.copy(red = num)) |
+        "green" ^^ (_ => (num: Int) => (h: Hand) => h.copy(green = num)) |
+        "blue" ^^ (_ => (num: Int) => (h: Hand) => h.copy(blue = num))
+    ) ^^ { case (num ~ f) => f(num) }
   val hand = rep1sep(update, ",").map(_.foldRight(Hand(0, 0, 0))(_(_)))
 
   val game = "Game" ~ num ~ ":" ~ repsep(hand, ";") ^^ {