用於數字拋出的正則表達式匹配MatchError

我試圖打破使用正則表達式在hrs：min格式的時間字符串，但它失敗並給出MatchError。這裏發生了什麼？使用Scala 2.10。用於數字拋出的正則表達式匹配MatchError

scala> val minsecs = """\d+:\d+""".r 
minsecs: scala.util.matching.Regex = \d+:\d+ 

scala> val minsecs(m,s) = "03:45" 
scala.MatchError: 03:45 (of class java.lang.String) 
     at .<init>(<console>:8) 
     at .<clinit>(<console>) 
     at .<init>(<console>:7) 
     at .<clinit>(<console>) 
     at $print(<console>) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
     at java.lang.reflect.Method.invoke(Method.java:597) 
     at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.call(IMain.scala:731) 
     at scala.tools.nsc.interpreter.IMain$Request.loadAndRun(IMain.scala:980) 
     at scala.tools.nsc.interpreter.IMain.loadAndRunReq$1(IMain.scala:570) 
     at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:601) 
     at scala.tools.nsc.interpreter.IMain.interpret(IMain.scala:565) 
     at scala.tools.nsc.interpreter.ILoop.reallyInterpret$1(ILoop.scala:745) 
     at scala.tools.nsc.interpreter.ILoop.interpretStartingWith(ILoop.scala:790) 
     at scala.tools.nsc.interpreter.ILoop.command(ILoop.scala:702) 
     at scala.tools.nsc.interpreter.ILoop.processLine$1(ILoop.scala:566) 
     at scala.tools.nsc.interpreter.ILoop.innerLoop$1(ILoop.scala:573) 
     at scala.tools.nsc.interpreter.ILoop.loop(ILoop.scala:576) 
     at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply$mcZ$sp(ILoop.scala:867) 
     at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:822) 
     at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1.apply(ILoop.scala:822) 
     at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135) 
     at scala.tools.nsc.interpreter.ILoop.process(ILoop.scala:822) 
     at scala.tools.nsc.interpreter.ILoop.main(ILoop.scala:889) 
     at xsbt.ConsoleInterface.run(ConsoleInterface.scala:57) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
     at java.lang.reflect.Method.invoke(Method.java:597) 
     at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:73) 
     at sbt.compiler.AnalyzingCompiler.console(AnalyzingCompiler.scala:64) 
     at sbt.Console.console0$1(Console.scala:23) 
     at sbt.Console$$anonfun$apply$2$$anonfun$apply$1.apply$mcV$sp(Console.scala:24) 
     at sbt.TrapExit$.executeMain$1(TrapExit.scala:33) 
     at sbt.TrapExit$$anon$1.run(TrapExit.scala:42)

來源

2013-05-26 Santosh Gokak

你需要使用二階捕獲組來提取值：

val minsecs = """(\d+):(\d+)""".r 
val minsecs(m,s) = "03:45"

注意加括號周圍\d+。

來源

2013-05-26 04:39:10 nickb

用於數字拋出的正則表達式匹配MatchError

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