Script to get TLDs from iana.org

get_tlds.rb

require 'open-uri'
require 'nokogiri'

doc = Nokogiri::HTML(open('http://www.iana.org/domains/root/db'))
tlds = []
doc.css('table#tld-table tr').each do |tr|
  info = tr.css('td')
  next if info.empty?

  tlds << {
    domain: info[0].text.gsub('.', ''),
    type: info[1].text
  }
end

def print_tld(tlds, type)
  puts tlds.select {|i| i[:type] =~ type}.map {|i| i[:domain]}.sort.join("|")
end

puts "# country-code"
print_tld(tlds, /country\-code/)

puts "# generic"
print_tld(tlds, /generic|sponsored|infrastructure|generic-restricted/)