java.lang.IllegalArgumentException: Must supply a valid regex string

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platform string needs none or two '-': x64-mingw32
java.lang.IllegalArgumentException: Must supply a valid regex string
at org.apache.flume.interceptor.RegexExtractorInterceptor$Builder.configure(
at org.apache.flume.node.AbstractConfigurationProvider.loadSources(
at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(
at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$
at java.util.concurrent.Executors$
at java.util.concurrent.FutureTask.runAndReset(
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(
at java.util.concurrent.ScheduledThreadPoolExecutor$
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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