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import PartialFunction.cond
import util._
object Test extends App {
object I { def unapply(x: String): Option[Int] = Try(x.toInt).toOption }
implicit class RX(val sc: StringContext) {
def rx = sc.parts.mkString("(.+)").r
}
Console println ("2 by 4" match {
case rx"${I(a)} by ${I(b)}" => a+b
case _ => -1
})
Console println ("2 by 4" match {
case rx"${_} by ${I(b)}" => b // pattern placeholder
case _ => -1
})
Console println ("2 by 4" match {
case rx"$_ by ${I(b)}" => b // is permitted this way, too
case _ => -1
})
}
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