Using Eval field in regular expression

[codywsj]

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.

[gcusello]

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

[codywsj]

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: