Regex in event rule not working

[pratiksha5]

I am trying to write a event rule. I need to filter it on the basis of event description. If the description dose not contain IP address then this rule should execute. 

Regex is : .*^(?!.*\b(?:\d{1,3}\.){3}\d{1,3}\b).*

I validated this on https://regex101.com/

But the rule is executing in both the conditions. Please guide. 

[Henrik Jutterst]

Not sure if you got this to work or not, but here's how I would do it:

The RegEx that I used was:
\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b

However this is only for IP 4 IP addresses, but you can probobly find more on the web if you look.
But as mentioned above. remember to mark the Ignore-checkbox if the RegEx Matches if you don't want to create Alerts from the event.

Link to RegEx reference: 7.16. Matching IPv4 Addresses