五年时间，入库企业研发投入总和增长了七成多（72.01%），增速是披露研发企业数量增幅（34.07%）的两倍以上，表明研发投入增长不只来自参与者增加，还包括企业个体研发力度大幅提升，以及资源向头部集中；企业研发投入平均值增幅达到28.21%，进一步印证了研发从“广度扩张”到“深度强化”的态势。
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both of these approaches use NFAs under the hood, which means O(m * n) matching. our approach is fundamentally different: we encode lookaround information directly in the automaton via derivatives, which gives us O(n) matching with a small constant. the trade-off is that we restrict lookarounds to a normalized form (?<=R1)R2(?=R3) where R1/R2/R3 themselves don’t contain lookarounds. the oracle-based approaches support more general nesting, but pay for it in the matching loop. one open question i have is how they handle memory for the oracle table - if you read a gigabyte of text, do you keep a gigabyte-sized table in memory for each lookaround in the pattern?。关于这个话题，爱思助手下载最新版本提供了深入分析
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