imap.rb

#!/usr/bin/env ruby
require "net/imap"

imap = Net::IMAP.new('imap.googlemail.com', port: 993, ssl: true)
imap.login('EMAIL', 'PASSWORD')
imap.examine('Sites')

results = imap.search(["SINCE" , "1-Jul-2012", "BODY" , "Discounts", "SUBJECT" , "buffalosite:trendygolf:email"])

puts "results: #{results.length}"

results.each do |message_id|
    body = imap.fetch(message_id,'BODY[TEXT]')[0].attr['BODY[TEXT]'].to_s.gsub(/=\r\n/ , '')
    id = body.match(/tgn[0-9]+/i).to_s
    discounts_loc = body.index( '">Discounts' )
    tr_loc = body.index( '</tr>' , discounts_loc )
    disc = body[discounts_loc...tr_loc].match(/&([^;]+);([0-9\.]+)/).to_a[1..2].join(',')

    puts "#{id},#{disc}"
end

imap.disconnect

Quick and very dirty script to extract some information from my GMail so I didn't have to manually search.