Hi Team,
I tried learning regular expression from regex101.com but unable to get all answer.Do we have any video or pdf where can check for understanding.Thanks
You can watch this .conf session for understanding regex use in splunk
http://conf.splunk.com/sessions/2017-sessions.html#search=Michael%20Simko&
I used www.regexone.com
to learn it. They have different levels which get harder and cover most of the basics. If you go through this 2-3 times then you will have enough regex knowledge to write your own