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.
Последние новости，这一点在谷歌浏览器下载中也有详细论述
as we wrote in the paper, RE# lets you write small fragments of regexes that describe individual properties of the matches you want, and then combine them with boolean operators to get the final result (below).，这一点在wps下载中也有详细论述
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