Splunk Search

Why is my rex command after upgrade to 6.3 not working

PPape
Contributor

Hello

I'm using this Regex command:

rex max_match=25 "\s+(?P<UserName>[^ ]+\s*\w*)\s+(?P<Status>[Allow|Deny]+)\s+(?P<Rigths>[\w+|-\d+][,\s+\w+]*)\n"

with Version 6.2.x it works fine but after upgrade to 6.3 I get this error:

Error in 'rex' command: Encountered the following error while compiling the regex '\s+(?P<UserName>[^ ]+\s*\w*)\s+(?P<Status>[Allow|Deny]+)\s+(?P<Rigths>[\w+|-\d+][,\s+\w+]*)\n': Regex: invalid range in character class

Here a pastebin of sample data -paste-

Am I the only one who is facing this?
I hope you can help me.

Best regards!

0 Karma
1 Solution

knielsen
Contributor

Hi,

pasting you rex expression into regex101 points out that [\w+|-\d+] is the problem. "-" is parsed as a range quantifier, which doesn't make sense in that expression. If that "-" should match an actual "-", then escape it with backslash.

Hth,
Kai.

View solution in original post

alacercogitatus
SplunkTrust
SplunkTrust

I'm not sure of the exact cause, but I can guess. 6.3 might have introduced stronger regex validation. That being the case, the " " (blank space) might be the cause.

Try this:

rex max_match=25 "\s+(?P<UserName>[^\s]+\s*\w*)\s+(?P<Status>Allow|Deny)+\s+(?P<Rights>[\w+|-\d+][,\s+\w+]*)\n"
0 Karma

knielsen
Contributor

Hi,

pasting you rex expression into regex101 points out that [\w+|-\d+] is the problem. "-" is parsed as a range quantifier, which doesn't make sense in that expression. If that "-" should match an actual "-", then escape it with backslash.

Hth,
Kai.

PPape
Contributor

Sorry for late response, this was the right Answer!
Thank you very mutch Kai!

0 Karma
Get Updates on the Splunk Community!

Using Machine Learning for Hunting Security Threats

WATCH NOW Seeing the exponential hike in global cyber threat spectrum, organizations are now striving more for ...

Observability Newsletter Highlights | March 2023

 March 2023 | Check out the latest and greatestSplunk APM's New Tag Filter ExperienceSplunk APM has updated ...

Security Newsletter Updates | March 2023

 March 2023 | Check out the latest and greatestUnify Your Security Operations with Splunk Mission Control The ...