Scala字符串模式匹配最佳实践

val pattern = "(\\d{4})-(\\d{2})-(\\d{2})".r
val pattern(year, month, day) = "2022-01-01"

object DatePattern {
  def unapplySeq(str: String): Option[Seq[Int]] = {
    val pattern = """(\d{4})-(\d{2})-(\d{2})""".r
    str match {
      case pattern(year, month, day) => Some(Seq(year.toInt, month.toInt, day.toInt))
      case _ => None
    }
  }
}

val DatePattern(year, month, day) = "2022-01-01"

object DatePattern {
  def unapply(str: String): Option[(Int, Int, Int)] = {
    val pattern = """(\d{4})-(\d{2})-(\d{2})""".r
    str match {
      case pattern(year, month, day) => Some((year.toInt, month.toInt, day.toInt))
      case _ => None
    }
  }
}

val DatePattern(year, month, day) = "2022-01-01"

val parts = "2022-01-01".split("-")
val year = parts(0).toInt
val month = parts(1).toInt
val day = parts(2).toInt