topic Re: Using Eval field in regular expression in Dashboards & Visualizations

Using Eval field in regular expression

codywsj — Wed, 01 Jul 2020 09:11:36 GMT

Hi,

I was wondering if we can use the field in eval inside the regular expression in rex?

my search query

| eval IP=if(("$spec_IP$"=="*"),"(?<file_ip>\d+.\d+.\d+.\d+)","$spec_IP$")
| rex field=_raw "\d{1,2}-\S{3}\s\d{2}:\d{2}:\d{2}.\d{3}\s\S{3}\s\[IP\]\s%NICWIN-4-Security_560_Security[\S\s]+?(?<log_time>(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s\d{2}\s\d{2}:\d{2}:\d{2})[\S\s]+?\S*Object\sName:\s(?<object_name>[\S\s]+?)New\sHandle\sID[\S\s]+?Primary\sUser\sName:\s(?<username>[\S\s]+?)\s+"

I am trying to use the eval field IP (bold & italic) in the regular expression in the rex command.

Re: Using Eval field in regular expression

gcusello — Wed, 01 Jul 2020 10:13:35 GMT

Hi @codywsj ,

did you tried to divide the eval statement in two rows?

| rex "(?<file_ip>\d+.\d+.\d+.\d+)" | eval IP=if(("$spec_IP$"=="*"),file_ip,"$spec_IP$") | rex "\d{1,2}-\S{3}\s\d{2}:\d{2}:\d{2}.\d{3}\s\S{3}\s\[IP\]\s%NICWIN-4-Security_560_Security[\S\s]+?(?<log_time>(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s\d{2}\s\d{2}:\d{2}:\d{2})[\S\s]+?\S*Object\sName:\s(?<object_name>[\S\s]+?)New\sHandle\sID[\S\s]+?Primary\sUser\sName:\s(?<username>[\S\s]+?)\s+"

Ciao.

Giuseppe

Re: Using Eval field in regular expression

codywsj — Wed, 01 Jul 2020 13:03:41 GMT

Hi @gcusello ,

what i meant was in the

eval IP=if(("$spec_IP$"=="*"),file_ip,"$spec_IP$")

the field "IP", i would like to use it in the regular expression of the rex field:

| rex "\d{1,2}-\S{3}\s\d{2}:\d{2}:\d{2}.\d{3}\s\S{3}\s\[IP\]\s%NICWIN-4-Security_560_Security[\S\s]+?(?<log_time>(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s\d{2}\s\d{2}:\d{2}:\d{2})[\S\s]+?\S*Object\sName:\s(?<object_name>[\S\s]+?)New\sHandle\sID[\S\s]+?Primary\sUser\sName:\s(?<username>[\S\s]+?)\s+"

By just typing the eval field into the regular expression, it does not work as SPLUNK does not process the "IP" as the field in the eval command rather it just takes it as a word "IP" literally.

\[IP\]

This is the output i got:

BIJ.PNG