Error with Rex exceeding match_limit, asking raising the value in limits.conf

ss026381 — Tue, 14 May 2019 20:38:18 GMT

I am fairly new to regex. I wrote a regex that works fine in regex101, but because I am doing lots of back tracking I guess , Splunk rex throws below error.
has exceeded configured match_limit, consider raising the value in limits.conf

I don't have access to limits.conf file, can someone help me with regex optimization.

URL to regex: https://regex101.com/r/fUcjqi/1

regex:

(?m)^(?<exceptionName>[\w.]*Exception).*\s*(\S*\s*)?(?<endStateComponent>[\w$#.]*)\.(?<endStateFunction>[\w$#.]+\.[\w$#]+)\(\D*(?<endStateOffset>\d+)?\S*\s*\S*\s*(?:\k<endStateComponent>|((?!com.custom).)\.\S*\s*\S*\s*)*((?<firstcustomComponent>com.custom.*)\.(?<firstcustomFunction>[\w$#.]+\.[\w$#]+)\(\D*(?<firstcustomOffset>\d+)?\S*\s*\S*\s*)?(?:(\k<endStateComponent>|\k<firstcustomComponent>|((?!com.custom).)*)\.\S*\s*\S*\s*)*((?<secondcustomComponent>com.custom.*)\.(?<secondcustomFunction>[\w$#.]+\.[\w$#]+)\(\D*(?<secondcustomOffset>\d+)?)?

sample log:

    Tue May 07 10:32:11 CDT 2019 SEVERE com.custom.financials.service.enterprise.server.financialinfo.PostRemittanceHandler [RequestHandler [1]] - [Error occurred when trying to post self pay remittance wrapper model][com.custom.system.enterprise.server:customdomain.custom.com][com.custom.system.enterprise.server:service:Financials][com.custom.system.enterprise.server:scp:368][com.custom.system.enterprise.server:message:PostRemittanceWrapperModel:4091003]
java.lang.NullPointerException: 
at 
com.custom.financials.service.enterprise.server.financialinfo.PostRemittanceHandler.handleRequest(PostRemittanceHandler.java:216)
at com.custom.financials.service.enterprise.server.FinancialsServer.handlePostRemittanceWrapperModel(FinancialsServer.java:1553)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.custom.financials.service.enterprise.server.FinancialsServer.handlePostRemittanceWrapperModel(FinancialsServer.java:1553)
at com.custom.system.enterprise.server.Server$ExecuteHandler.invoke(Server.java:422)
at com.custom.system.enterprise.server.Server.execute(Server.java:346)
at com.custom.system.enterprise.server.container.ServerContainer$EndInterceptor.intercept(ServerContainer.java:583)
at com.custom.system.enterprise.server.container.InterceptorChainImpl.execute(InterceptorChainImpl.java:53)
at com.custom.system.enterprise.server.container.ServerContainer$1.run(ServerContainer.java:386)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:360)
at com.custom.system.enterprise.server.container.ServerContainer.execute(ServerContainer.java:382)
at com.custom.system.enterprise.server.cadence.service.RRService$HandlerRunner.run(RRService.java:104)
at com.custom.system.enterprise.server.cadence.service.InstrumentedThreadPoolExecutor$InstrumentedRunnable.run(InstrumentedThreadPoolExecutor.java:210)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at com.custom.system.enterprise.server.cadence.service.ServiceManager$ContextCleaningThread.run(ServiceManager.java:373)

Re: Error with Rex exceeding match_limit, asking raising the value in limits.conf

codebuilder — Tue, 14 May 2019 22:16:56 GMT

Your regex is causing catastrophic backtracking. You need to check it with different types of examples, and more of them.

By adding just two spaces to the example you pasted I was able to cause it to fail.

Splunk (thankfully) protects itself from catastrophic backtracking with a limit of 100K.

Re: Error with Rex exceeding match_limit, asking raising the value in limits.conf

ss026381 — Tue, 14 May 2019 22:36:12 GMT

Can you please save your changes https://regex101.com/r/fUcjqi/1 with version where it failed

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Error with Rex exceeding match_limit, asking raising the value in limits.conf

Re: Error with Rex exceeding match_limit, asking raising the value in limits.conf

Re: Error with Rex exceeding match_limit, asking raising the value in limits.conf