I know this particular problem space well. AI is a reasonable solution. WHOIS records are intentionally made to be human readable and not be machine parseable w

I know this particular problem space well. AI is a reasonable solution. WHOIS records are intentionally made to be human readable and not be machine parseable without huge effort because so many people were scraping them. So the same registrar may return records in a huge range of text formats. You can write code to handle them all if you really want to, but if you are not doing it en masse, AI is going to probably be a cheaper solution. Example: https://github.com/weppos/whois https://github.com/weppos/whois is a very solid library for whois parsing but cannot handle all servers, as they say themselves. That has fifteen + years of work on it.