Sane, modular DNS SOA record parsing implementations

• Fields are based on https://www.ripe.net/publications/docs/ripe-203

The best-guess email addresses are parsed from the rname field:

• Replacing with @:
  • the second from last . (email_parsed_last)
  • the first . (email_parsed_first)

Both likeliest email addresses are returned. It is then up to human inspection to decide which email is correct.

Trailing periods are stripped