Regex for multiple IP Addresses in Splunk

[asplunk123]

In the below log we have User Agent fallowed by two Ip addresses. So i want to extract below fields

UserAgent , IPAdd2, IPAdd2

My Regex : (getting error)

rex (?.[a-zA-Z0-9-/^%?;.\s\w&()=-]+) | rex "^(?i)(?P[^ ,]+)(,(?P[^ ,]+))?"

Log :

"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/28.0" "158.69.213.225, 23.217.200.191"

[woodcock]

This will create a mult-valued field:

... | rex max_match=0 "(?<IPAddress>\d+\.\d+\.\d+\.\d+)"

You can use a more specific RegEx if you like, but the more complicated it is, the slower it will be, too, and simpler ones are unlikely to have false positives.