![]() Splunk Regex document from SplunkConf 2017: Datei:Regex-in-your-spl. You want the only value captured with the Group-Name of "Value" You can name a captured group with regex. "?" = this group "group 3" 0 or 1 times."" = match upper and lower case A-Z or/and numbers from 0-9 or/and special character "-" escaped with "\".The search returns a table that lists the top source IP addresses (src_ip) and ports of the potential attackers.This regex in the replace function generates a new field "NewField" with the value of the first regex capture of the old field "OldField" | eval NewField=replace(OldField, "(?:SCVMM )?(+)(?: Resources( ?:\(1\))?)?", "\1") This search uses the rex command to extract the port field and values. Sourcetype=linux_secure port "failed password" | rex "\s+(?port \d+)" | top src_ip ports showperc=0 Display IP address and ports of potential attackersĭisplay IP address and ports of potential attackers. | rex offset_field=off field=list "(?fgh)"ħ. ![]() You can identify the position of several of the middle values in the field list using the regular expression "(?fgh)". | rex offset_field=off field=list "(?abcde)" You can identify the position of the first five values in the field list using the regular expression "(?abcde)". The following example starts with the makeresults command to create a field with a value:Īdd the rex command with the offset_field argument to the search to create a field called off. To identify the position of certain values in a field, use the rex command with the offset_field argument and a regular expression. The regular expression removes the quotation marks and any leading or trailing spaces around the quotation marks. This search creates an event with three fields, _time, search, and orig_search. This example shows how to use the rex command sed expression with capture replace using \1, \2 to reuse captured pieces of a string. Use a sed expression with capture replace for strings ![]() For example, if the rex expression is "(?./XXXX-XXXX-XXXX-/g" 5. 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. What are Rex and Erex Commands After extracting fields, you may find that some fields contain specific data you would like to manipulate, use for calculations, or display by themselves. 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 The rex command allows you to use regular expression named capture groups. Use the rex command for search-time field extraction or string replacement and character substitution. We can see the regular expression Splunk used to match by clicking on the Job menu. ![]() 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. Use this command to either extract fields using regular expression named groups, or replace or substitute characters in a field using sed expressions. ![]()
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