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.
February 26, 2026
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2024年7月中共中央政治局召开会议，分析研究经济形势和经济工作时，由网络流行语演变而来的“内卷式”竞争第一次出现在官方表述中，指代行业之间无序竞争的一种现实问题。