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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，heLLoword翻译官方下载提供了深入分析
lists this version as being published in February 1991, so ~35 years ago this month.
過往不少示威者多被控非法集結或公眾妨擾等罪名，但在《香港國安法》下，他們面臨更嚴厲刑罰，最高可判終身監禁。