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?
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2015年前后，受政策鼓励和资本关注，一批保险科技企业如雨后春笋般涌现，当年就有92家新公司成立，投融资交易量也激增至142笔，同比增长近168%。
If an area does not have any color coding, it means there are no conditions on the portions of dominoes within those spaces.