正则表达式提取器

具有分组部分的正则表达式可用作提取器：

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

请注意，当它不匹配时，将在运行时抛出 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)