class ActionDispatch::HostAuthorization::Permissions

def sanitize_string(host)
  if host.start_with?(".")
    /\A#{SUBDOMAIN_REGEX}?#{Regexp.escape(host[1..-1])}#{PORT_REGEX}?\z/i
  else
    /\A#{Regexp.escape host}#{PORT_REGEX}?\z/i
  end
end