find_users (Irc::Server)

    # File lib/rbot/irc.rb, line 1971
        def find_users(mask)
          nm = new_netmask(mask)
          @users.inject(UserList.new) {
            |list, user|
            if user.user == "*" or user.host == "*"
              list << user if user.nick.irc_downcase(casemap) =~ nm.nick.irc_downcase(casemap).to_irc_regexp
            else
              list << user if user.matches?(nm)
            end
            list
          }
        end