MAC 地址的 Scala REGEX 匹配
Scala REGEX match for MAC address
晚上好,Whosebug,
我被困在无法让 Scala 正则表达式匹配正常运行的地方,这是我的代码
private def handle_read(packet: TFTPReadRequestPacket, tftp_io: TFTP): Unit = {
val MAC_REGEX = "([0-9A-F]{2}[:-]){5}([0-9A-F]{2})".r
packet.getFilename match {
case MAC_REGEX(a) => println(s"Client is coming from $a")
}
}
当正则表达式为 ([0-9A-F]{2}[:-])
并且我请求文件 70-
时它很好并且吐出客户端是 "coming from 70",但是当它是完整的正则表达式并且我请求 70-CD-60-74-24-9C
它抛出这样的异常
[ERROR] [04/28/2015 21:25:27.818] [polydeploy-baremetal-akka.actor.default-dispatcher-4] [akka://polydeploy-baremetal/user/TFTP_Queue] 70-CD-60-74-24-9C (of class java.lang.String)
scala.MatchError: 70-CD-60-74-24-9C (of class java.lang.String)
at com.polydeploy.baremetal.TFTPQueue$.handle_read(TFTPQueue.scala:40)
at com.polydeploy.baremetal.TFTPQueue$.com$polydeploy$baremetal$TFTPQueue$$handle_request(TFTPQueue.scala:33)
at com.polydeploy.baremetal.TFTPQueue$$anonfun$receive.applyOrElse(TFTPQueue.scala:14)
at akka.actor.Actor$class.aroundReceive(Actor.scala:467)
at com.polydeploy.baremetal.TFTPQueue$.aroundReceive(TFTPQueue.scala:10)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
at akka.dispatch.Mailbox.run(Mailbox.scala:221)
at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
我想要尝试和积累的是能够让 TFTP 请求进入 pxelinux.cfg/01-70-CD-60-74-24-9C
并提取 MAC 地址。
非常感谢任何帮助!
谢谢,利亚姆。
When the regex is ([0-9A-F]{2}[:-])
and I request for the file 70-
it is fine
这是因为,在这种情况下,您的正则表达式只包含一个组。
这对我有用:
val MAC_REGEX = "(([0-9A-F]{2}[:-]){5}([0-9A-F]{2}))".r
"70-CD-60-74-24-9C" match {
case MAC_REGEX(a, _*) => println(s"Client is coming from $a")
}
// prints "Client is coming from 70-CD-60-74-24-9C"
之所以有效,是因为我用一个组包裹了整个正则表达式。 a
捕获该外部组,而 _*
是所有其他组的一系列忽略匹配项。显然 Regex
的提取器 returns 一个列表,每个捕获组都有一个元素。
不过我觉得有更好的方法...
晚上好,Whosebug,
我被困在无法让 Scala 正则表达式匹配正常运行的地方,这是我的代码
private def handle_read(packet: TFTPReadRequestPacket, tftp_io: TFTP): Unit = {
val MAC_REGEX = "([0-9A-F]{2}[:-]){5}([0-9A-F]{2})".r
packet.getFilename match {
case MAC_REGEX(a) => println(s"Client is coming from $a")
}
}
当正则表达式为 ([0-9A-F]{2}[:-])
并且我请求文件 70-
时它很好并且吐出客户端是 "coming from 70",但是当它是完整的正则表达式并且我请求 70-CD-60-74-24-9C
它抛出这样的异常
[ERROR] [04/28/2015 21:25:27.818] [polydeploy-baremetal-akka.actor.default-dispatcher-4] [akka://polydeploy-baremetal/user/TFTP_Queue] 70-CD-60-74-24-9C (of class java.lang.String)
scala.MatchError: 70-CD-60-74-24-9C (of class java.lang.String)
at com.polydeploy.baremetal.TFTPQueue$.handle_read(TFTPQueue.scala:40)
at com.polydeploy.baremetal.TFTPQueue$.com$polydeploy$baremetal$TFTPQueue$$handle_request(TFTPQueue.scala:33)
at com.polydeploy.baremetal.TFTPQueue$$anonfun$receive.applyOrElse(TFTPQueue.scala:14)
at akka.actor.Actor$class.aroundReceive(Actor.scala:467)
at com.polydeploy.baremetal.TFTPQueue$.aroundReceive(TFTPQueue.scala:10)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254)
at akka.dispatch.Mailbox.run(Mailbox.scala:221)
at akka.dispatch.Mailbox.exec(Mailbox.scala:231)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
我想要尝试和积累的是能够让 TFTP 请求进入 pxelinux.cfg/01-70-CD-60-74-24-9C
并提取 MAC 地址。
非常感谢任何帮助!
谢谢,利亚姆。
When the regex is
([0-9A-F]{2}[:-])
and I request for the file70-
it is fine
这是因为,在这种情况下,您的正则表达式只包含一个组。
这对我有用:
val MAC_REGEX = "(([0-9A-F]{2}[:-]){5}([0-9A-F]{2}))".r
"70-CD-60-74-24-9C" match {
case MAC_REGEX(a, _*) => println(s"Client is coming from $a")
}
// prints "Client is coming from 70-CD-60-74-24-9C"
之所以有效,是因为我用一个组包裹了整个正则表达式。 a
捕获该外部组,而 _*
是所有其他组的一系列忽略匹配项。显然 Regex
的提取器 returns 一个列表,每个捕获组都有一个元素。
不过我觉得有更好的方法...