better-regex.rb

def clear_cache domain
  domain_parts = domain.match(/(?:[^:]*:\/\/)?([^\/]+\.[^\/]+)/)
  domain = domain_parts[1]

  Net::HTTP.get(domain, "/")
end

check-for-nil.rb

def clear_cache domain
  raise "No domain specified." if domain.nil?

  domain_parts = domain.match(/(?:[^:]*:\/\/)?([^\/]+\.[^\/]+)/)
  domain = domain_parts[1]

  Net::HTTP.get(domain, "/")
end

exception-catching-with-logging.rb

require 'logger'
require 'net/http'

@log = Logger.new(STDOUT)
@log.level = Logger::WARN

def clear_cache domain
  if domain.nil?
    @log.warn "No domain specified."
  else
    begin
      uri = URI(domain)
      Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
        request = Net::HTTP::Get.new uri
      end
    rescue
      @log.warn "Error reaching #{domain}."
    end
  end
end

clear_cache "robtarr.net"

puts "This code should still execute without any issues."

original-method.rb

def clear_cache domain
  domain.gsub!(/http\:\/\//,"")
  Net::HTTP.get(domain, "/")
end


clear_cache "http://example.com"