![]() If the REGEX does not have n groups, the matching fails.For index-time transforms, you use $n to specify the output of each REGEX match (for example, $1, $2, and so on).FORMAT behaves differently depending on whether the extraction takes place at search time or index time.You don't need to specify the FORMAT if you have a simple REGEX with name-capturing groups. Use it to specify the format of the field-value pair(s) that you are extracting, including any field names or values that you want to add. For example, the following are equivalent:.If the REGEX extracts both the field name and its corresponding value, you can use the following special capturing groups to skip specifying the mapping in the FORMAT attribute:.Name-capturing groups in the REGEX are extracted directly to fields, which means that you don't have to specify a FORMAT for simple field extraction cases.REGEX is a regular expression that operates on your data to extract fields.The is required for all transforms, as is the REGEX.Do not assign field names that contain international characters.Īdd a regex stanza for the new field to nfįollow this format when you define an index-time field transform in nf (Note: Some of these attributes, such as LOOKAHEAD and DEST_KEY, are only required for certain use cases):.Avoid assigning field names that match any of the default field names.Splunk reserves leading underscores for its internal variables. Field names cannot begin with 0-9 or _.Valid characters for field names are a-z, A-Z, 0-9.Therefore, you must deploy the props and transforms changes to the forwarders, not the search peers.įor details on Splunk Enterprise distributed components, read Scale your deployment with Splunk Enterprise components in the Distributed Deployment Manual.įor details on where you need to put configuration settings, read Configuration parameters and the data pipeline in the Admin Manual. If you are employing heavy forwarders in front of your search peers, the props and transforms processing takes place on the forwarders, not the search peers. Deploy the nf changes to the search head.Deploy the nf and nf changes to each of the search peers.If you have a distributed search deployment, processing is split between search peers (indexers) and a search head. Where to put the configuration changes in a distributed environment For more information on configuration files in general, see About configuration files in the Admin manual. You can only apply search-time knowledge to those events.ĭefine additional indexed fields by editing nf, nf, and nf.Įdit these files in $SPLUNK_HOME/etc/system/local/ or in your own custom application directory in $SPLUNK_HOME/etc/apps/. Also, you can't change the fields on data that have already been indexed. Adding to this list of fields decreases performance, as each indexed field increases the size of the searchable index. This includes fields such as timestamp, punct, host, source, and sourcetype. ![]() Unless absolutely necessary, do not add custom fields to the set of default fields that Splunk software automatically extracts and indexes at index time. If you have not created private apps, contact your Splunk account representative for help with this customization. If you are a Splunk Cloud Platform administrator with experience creating private apps, see Manage private apps in your Splunk Cloud Platform deployment. If you have Splunk Cloud Platform and want to define index-time field extractions, you must create a private app that contains your desired configurations. For example, if you typically search only for foo=1, but 1 occurs in many events that do not have foo=1, you might want to add foo to the list of fields extracted by Splunk at index time.įor more information about creating custom field extractions see About fields in the Knowledge Manager manual. You also might want to add an indexed field if the value of a search-time extracted field exists outside of the field more often than not. ![]() This can happen, for example, if you typically search a large event set with expressions like foo!=bar or NOT foo=bar, and the field foo nearly always takes on the value bar. However, there are times when you might need to add to the set of custom indexed fields that are applied to your events at index time.įor example, you might have certain search-time field extractions that noticeably impact search performance. ![]() In general, you should try to extract your fields at search time. ![]()
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