problems with the pantheon terminal

I was in "pry shell" writing some code... When I wrote ... )
in pry(main) the next text... Nokogiri::HTML(open 'http://'+url).css('product_addtocart_form')
Thee terminal becames crazy... and there's no way to solve it...
I need to solve this problem... if not... I love Elementary os features and design but I can't work like this, at leas not now as Jr. developer =(