11/23/2023 0 Comments Splunk rex escape characters![]() To set up a character class, define a range with a hyphen, such as, to match any uppercase letter. You can apply quantifiers to and use alternation within enclosed groups.Ĭharacters enclosed in square brackets. Groups can define character classes, repetition matches, named capture groups, modular regular expressions, and more. Regular expressions allow groupings indicated by the type of bracket used to enclose the regular expression characters. The metacharacters that define the pattern that Splunk software uses to match against the literal. The exact text of characters to match using a regular expression. Regular expressions terminology and syntax Term However, the Splunk platform does not currently allow access to functions specific to PCRE2, such as key substitution. The Splunk platform includes the license for PCRE2, an improved version of PCRE. Splunk regular expressions are PCRE (Perl Compatible Regular Expressions) and use the PCRE C library. See Quick Reference for SPL2 eval functions in the SPL2 Search Reference. ![]() Search commands that use regular expressions include rex and evaluation functions such as match and replace. You also use regular expressions when you define custom field extractions, filter events, route data, and correlate searches. Regular expressions match patterns of characters in text and are used for extracting default fields, recognizing binary file types, and automatic assignation of source types. For a discussion of regular expression syntax and usage, see an online resource such as or a manual on the subject. (I edited your question on the assumption that you had pasted the literal string without editing.This primer helps you create valid regular expressions. ![]() However, I'm also not sure that the search you provided in your question was correct, as I don't know if you typed extra backslashes in your search string to make it display right, or if you pasted in unchanged. I wonder what version of Splunk you're on and if there was a bug that was fixed. The resulting regex that is actually applied in the above examples then are ^mydomain\x5c and ^mydomain\\ Note that in the Splunk search string, backslashes that you want to have as part of a regex must themselves be escaped with a backslash. Returning g as myname, so I'm not sure why you have the problem. So this works: | stats count | eval f="mydomain\myname" | eval g=replace(f,"^mydomain\\x5c","")īut in addition, this works perfectly for me: | stats count | eval f="mydomain\myname" | eval g=replace(f,"^mydomain\\\\","") See: : \x, \000 character whose ordinal is the given octal number Splunk regexes are PCRE, which does allow you to specify a character by codepoint. It would be nice if Splunk developers included "chr(ascii-code)" command, when any character in the search string could be replaced with ASCII code at places, where the escaping nonsense happens. It gets broken thinking that I am escaping the parenthesis. Same thing happens if I try to extract "myuser" from the username with rex: rex field=_raw "^client\\\\(?.*)" Statement "\\" should escape \ sign and not double quotes. How can I get rid of the damn backslash? I am surprised that splunk matches from the right side instead of from the left. When I take "\" out of the statement: source="/var/log/iis" | eval username=lower(username) | eval username=replace(username,"mydomain","") | stats count by username | sort -count Gets broken with error message, because splunk thinks that I am escaping double quotes, instead of \ sign. Search: source="/var/log/iis" | eval username=lower(username) | eval username=replace(username,"mydomain\\\\","") | stats count by username | sort -count I need to remove "mydomain\" string from the username. It screws up the results for "stats", because myuser and mydomain\myuser are taken as two different users. Sometimes our users login to our web application using username: "myuser" or "mydomain\myuser".
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