"Adding the referrer stuff MBS-2022 breaks the links because it uses amazon.uk instead of amazon.co.uk", says nikki.
Could we also include "www." and use .co.jp instead of .jp? There's no point having unnecessary redirects.
According to http://beckism.com/2008/02/amazon_affiliate_links/ we could just use http://www.amazon.$domain/dp/$asin?tag=$associatetag
I'm using the links that are mentioned in Amazon's official API, the regex just doesn't catch the full tld though. Would rather stick with keeping to the docs.
Fixed in 58d5f0e.