IPv4:
```
\b(?:(?:25[0-5]|2[0-4]\d|1?[1-9]?\d)\.){3}(?:25[0-5]|2[0-4]\d|1?[1-9]?\d)\b
```

IPv6:
```
((([\dA-Fa-f]{1,4}:){7}([\dA-Fa-f]{1,4}|:))|(([\dA-Fa-f]{1,4}:){6}(:[\dA-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([\dA-Fa-f]{1,4}:){5}(((:[\dA-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([\dA-Fa-f]{1,4}:){4}(((:[\dA-Fa-f]{1,4}){1,3})|((:[\dA-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([\dA-Fa-f]{1,4}:){3}(((:[\dA-Fa-f]{1,4}){1,4})|((:[\dA-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([\dA-Fa-f]{1,4}:){2}(((:[\dA-Fa-f]{1,4}){1,5})|((:[\dA-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([\dA-Fa-f]{1,4}:){1}(((:[\dA-Fa-f]{1,4}){1,6})|((:[\dA-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[\dA-Fa-f]{1,4}){1,7})|((:[\dA-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%[\da-zA-Z]+)?
```