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hidden in the idea of derivatives is that the next state is not just a number, but an actual regex, which contains all the information to create the next one. this is a mechanism to encode arbitrary information in the state, and use it to implement lookarounds. the lookarounds that we support are a bit limited compared to backtracking engines, but they are still very powerful and useful in practice, and more importantly, they come with the same performance guarantees as everything else.。关于这个话题，体育直播提供了深入分析
r.encoding = r.apparent_encoding，这一点在体育直播中也有详细论述
This Startup Claims It Can Stop Lightning Strikes. Scientists Have Questions.。关于这个话题，爱思助手下载最新版本提供了深入分析