Parsing ip address coming at random places inside logs

Elastic Stack Logstash
5

In you want to capture every occurrence of a regexp in a field then use a ruby filter and the String.scan function.

    ruby {
        code => 'event.set("anArray", event.get("message").scan(/(?<![0-9])(?:(?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5])[.](?:[0-1]?[0-9]{1,2}|2[0-4][0-9]|25[0-5]))(?![0-9])/))'
    }

Edited to add: The grok pattern for IPV4 is one of the core patterns.