![]() Default: 1 offset_field Syntax: offset_field= Description: Creates a field that lists the position of certain values in the field argument, based on the regular expression specified in regex-expression. If your regex contains a capture group that can match multiple times within your pattern, only the last capture group is used for multiple matches. Multiple matches apply to the repeated application of the whole pattern. If greater than 1, the resulting fields are multivalued fields. ![]() Default: _raw max_match Syntax: max_match= Description: Controls the number of times the regex is matched. Optional arguments field Syntax: field= Description: The field that you want to extract information from. Sed mode supports the following flags: global (g) and Nth occurrence (N), where N is a number that is the character location in the string. sed-expression Syntax: "" Description: When mode=sed, specify whether to replace strings (s) or substitute characters (y) in the matching regular expression. mode Syntax: mode=sed Description: Specify to indicate that you are using a sed (UNIX stream editor) expression. Regex-expression Syntax: "" Description: The PCRE regular expression that defines the information to match and extract from the specified field. Rex ( ) | ( mode=sed ) Required arguments Use the rex command for search-time field extraction or string replacement and character substitution. Running the rex command against the _raw field might have a performance impact. If a field is not specified, the regular expression or sed expression is applied to the _raw field. Read about using sed to anonymize data in the Getting Data In Manual. This sed-syntax is also used to mask, or anonymize, sensitive data at index-time. When mode=sed, the given sed expression used to replace or substitute characters is applied to the value of the chosen field. The rex command matches the value of the specified field against the unanchored regular expression and extracts the named groups into fields of the corresponding names. The first Regex Function splits the event to separate the actual data from the header information.Use this command to either extract fields using regular expression named groups, or replace or substitute characters in a field using sed expressions. So we'll use two Regex Extract Functions. With this type of event structure, properly extracting each event field into a separate metadata field requires two-stage processing. This event is from a CheckPoint Firewall CMA system. Defaults to 100.įield name format expression: JavaScript expression to format field names when _NAME_n and _VALUE_n capturing groups are used. Named capturing groups will always use a value of 1. Max exec: The maximum number of times to apply the Regex to the source field when the global flag is set, or when using _NAME_N and _VALUE_N capturing groups. Source field: Field on which to perform regex field extraction. See Examples below.Īdditional regex: Click Add Regex to chain extra regex conditions. Can contain special _NAME_N and _VALUE_N capturing groups, which extract both the name and value of a field, e.g.: (?+)=(?+). Must contain named capturing groups, e.g.: (?bar). Defaults to empty.įinal: If toggled to Yes, stops feeding data to the downstream Functions. Defaults to true, meaning it evaluates all events.ĭescription: Simple description of the Function. Usage įilter: Filter expression (JS) that selects data to feed through the Function. They are ephemeral: they can be used by any Function downstream, but will not be added to events, and will not exit the Pipeline. Fields that start with _ (double underscore) are special in Cribl Stream. (In Splunk, these will be index-time fields). The Regex Extract Function extracts fields using regex named groups.
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