创建正则表达式来解析文件 – Java

我有一个我想用以下格式解析的日志文件:

225:org.powertac.common.Competition::0::new::game-0
287:org.powertac.common.Competition::0::withSimulationBaseTime::1255132800000
288:org.powertac.common.Competition::0::withTimezoneOffset::-6
288:org.powertac.common.Competition::0::withLatitude::45
289:org.powertac.common.Competition::0::withBootstrapTimeslotCount::336
289:org.powertac.common.Competition::0::withBootstrapDiscardedTimeslots::24
290:org.powertac.common.Competition::0::withMinimumTimeslotCount::1400
290:org.powertac.common.Competition::0::withExpectedTimeslotCount::1440
291:org.powertac.common.Competition::0::withTimeslotLength::60
291:org.powertac.common.Competition::0::withSimulationRate::720
292:org.powertac.common.Competition::0::withTimeslotsOpen::24
292:org.powertac.common.Competition::0::withDeactivateTimeslotsAhead::1
300:org.powertac.du.DefaultBrokerService$LocalBroker::1::new::default broker
300:org.powertac.du.DefaultBrokerService$LocalBroker::1::setLocal::true
2074:org.powertac.common.RandomSeed::2::init::CompetitionControlService::0::game-setup::5354386935242895562
2157:org.powertac.common.TimeService::null::setCurrentTime::2009-10-10T00:00:00.000Z
2197:org.powertac.common.RandomSeed::3::init::AccountingService::0::interest::-8975848432442556652
2206:org.powertac.common.RandomSeed::4::init::TariffMarket::0::fees::-6239716112490883981
2213:org.powertac.common.msg.BrokerAccept::null::new::1
2214:org.powertac.common.msg.BrokerAccept::null::new::1::null
2216:org.powertac.common.RandomSeed::5::init::org.powertac.du.DefaultBrokerService::0::pricing::8741252857248937781
2226:org.powertac.common.TariffSpecification::6::new::1::CONSUMPTION
2231:org.powertac.common.Rate::7::new
2231:org.powertac.common.Rate::7::withValue::-0.5
2232:org.powertac.common.Rate::7::setTariffId::6

模式如下:
  对于一个新对象:

<id>:<classname>::<order_of_execution>::<new>::<args>

对于方法调用:

 <id>:<classname>::<order_of_execution>::<method_name>::<args>

对于内部类:

 <id>:<classname$innerclass>::<order_of_execution>::<method_name or new>::<args>

对于初始调用:

 <id>:<classname>::<order_of_execution>::<init>::<args>

我想要一个处理所有情况的正则表达式,我将能够检索每个值,如案例中所示.
如果我想创建一个新对象,那么我将在Java中使用Reflection API.
所以,例如:

2231:org.powertac.common.Rate::7::new

将被解析为“2231”,“org.powertac.common.Rate”,“7”,“new”,args = {}.
我怎么能想出这样的正则表达式?

最佳答案 将
Matcher与捕获组一起使用:

String s = "225:org.powertac.common.Competition::0::new::game-0";
Pattern p = Pattern.compile("([^:]+):([^:]+)::([\\d]+)::([^:]+)::(.+)");
Matcher m = p.matcher(s);
if (m.find()) {
  String id = m.group(1);
  String className = m.group(2);
  int orderOfExecution = Integer.valueOf(m.group(3));
  String methodNameOrNew = m.group(4);
  String[] arguments = m.group(5).split("::");
}

或者更简单的方法,使用java.util.Scanner,将分隔符设置为:: ?:

Scanner scanner = new Scanner(s);
scanner.useDelimiter("::?");
int id = scanner.nextInt();
String className = scanner.next();
int orderOfExecution = scanner.nextInt();
String methodNameOrNew = scanner.next();
scanner.useDelimiter("$").skip("::");
String[] arguments = scanner.next().split("::");
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