正規表示式提取器

具有分組部分的正規表示式可用作提取器：

scala> val address = """(.+):(\d+)""".r
address: scala.util.matching.Regex = (.+):(\d+)

scala> val address(host, port) = "some.domain.org:8080"
host: String = some.domain.org
port: String = 8080

請注意，當它不匹配時，將在執行時丟擲 MatchError：

scala> val address(host, port) = "something not a host and port"
scala.MatchError: something not a host and port (of class java.lang.String)