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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.
Credit: Stan Schroeder/Mashable，详情可参考快连下载-Letsvpn下载
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Питтсбург Пингвинз，这一点在谷歌浏览器下载中也有详细论述