Use https://regexr.com/


* Extract IP/Domain from a URL (group[2])
```
^(http|https)://([^/]*)/?
```


* Parse IP
```
(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}
```