Amazon URL stripper

amazon_url_stripper.rb

affiliate_id = "nathos-20"

ARGF.each do |f|
    f = f.scan(/(?:http:\/\/(?:www\.){0,1}amazon\.com(?:\/.*){0,1}(?:\/dp\/|\/gp\/product\/))(.*?)(?:\/.*|$)/i)
    shorturl = "http://www.amazon.com/dp/" + f.to_s + "/ref=nosim/" + affiliate_id
    if shorturl == ("http://www.amazon.com/dp//ref=nosim/" + affiliate_id)
        puts "Not a valid Amazon URL"
    else
        puts shorturl
    end
end