check_bot.rb

# encoding: utf-8
# $ ruby check_bot.rb
require 'open-uri'

@url = 'https://registrano.com/events/handlino-new-opening/registrations/new'

def check?
  open(@url) do |f|
    f.each_line do |line|
      if line.include? '抱歉，目前本活動已額滿。'
         puts '抱歉，目前本活動已額滿。'
         return false
      end
    end
  end
end

while(1) do
  system("open #{@url}") if check?
  sleep 60
end