By default the top command returns the top 10 values. Use the top command to return the most common port values. You must specify several examples with the erex command. Then use the erex command to extract the port field.Sourcetype=secure* port "failed password" Run a search to find examples of the port values, where there was a failed login attempt.Use the time range All time when you run the search.ĭetermine which are the most common ports used by potential attackers. To try this example on your own Splunk instance, you must download the sample data and follow the instructions to get the tutorial data into Splunk. Extract values based on examples and return the most common values This example uses the sample data from the Search Tutorial. The extracted values are put into the monthday attribute. The following search extracts out month and day values like 7/01 and 7/02, but not patterns like 99/2. Extract values based on examples and counter examples The following search extracts out month and day values like 7/01 and puts the values into the monthday attribute. See Dispatch directory and search artifacts in the Search Manual.Įxamples 1. The search logs are not indexed by default. The search.log file is located in the $SPLUNK_HOME/var/run/splunk/dispatch/ directory. You can see the output by searching for "Successfully learned regex". The output of the erex command is captured in the search.log file. You can see the regular expression that is generated based on the erex command by clicking the Job menu in Splunk Web. Under the stanza, change the value for the infocsv_log_level setting.Open or create a local nf file at $SPLUNK_HOME/etc/system/local.Make changes to the files in the local directory. The files in the default directory must remain intact and in their original location. Never change or copy the configuration files in the default directory. Review the steps in How to edit a configuration file in the Splunk Enterprise Admin Manual.Only users with file system access, such as system administrators, can edit configuration files.Splunk Enterprise To change the the infocsv_log_level setting in the nf file, follow these steps. Otherwise, contact Splunk Customer Support. If you have a support contract, file a new case using the Splunk Support Portal at Support and Services. Splunk Cloud Platform To change the infocsv_log_level setting, request help from Splunk Support. If you do not see the informational log messages when you click Jobs from the Activity menu, make sure that infocsv_log_level is set to the default, which is INFO. However, these messages aren't displayed if the infocsv_log_level setting is set to WARN or ERROR. Then copy the field values that you want to extract and use those for the example values with the Click the Job menu to see the generated regular expression based on your examples.Īfter you run a search or open a report in Splunk Web, the erex command returns informational log messages that are displayed in the search jobs manager window. To make sure that the erex command works against your events, first run the search that returns the events you want without the erex command. If the values do not exist, the command fails. The values specified in the examples and counterexample arguments must exist in the events that are piped into the erex command. Default: _raw maxtrainers Syntax: maxtrainers= Description: The maximum number values to learn from. fromfield Syntax: fromfield= Description: The name of the existing field to extract the information from and save into a new field. Description: A comma-separated list of example values that represent information not to be extracted. Optional arguments counterexamples Syntax: counterexamples=. That regular expression can then be used with the rex command for more efficient extraction. The resulting regular expression is generated and placed as a message under the Jobs menu in Splunk Web. field Syntax: Description: A name for a new field that will take the values extracted from the fromfield argument. Use quotation marks around the list if the list contains spaces. Description: A comma-separated list of example values for the information to extract and save into a new field. The search also returns a regular expression that you can then use with the rex command to extract the field.Įrex examples= Required arguments examples Syntax: examples=. The values extracted from the fromfield argument are saved to the field. The command automatically extracts field values that are similar to the example values you specify. Use the erex command to extract data from a field when you do not know the regular expression to use.
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