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Credit: The Pokémon Company，更多细节参见夫子
The headline: 96.5% of confusables.txt is not high-risk。关于这个话题，Line官方版本下载提供了深入分析
Наука и техника。体育直播对此有专业解读
Finally, there is (of course!) a large set of regexes that assume a 2-3 characters long TLD, like [a-z0-9._%+-]{1,40}[@]{1}[a-z]{1,10}[.]{1}[a-z]{2,3}. Some of them take the safer path and assume 2-4, for some reason.