这表明，苹果预计这次 3 月发布会新品上市后的需求会相当旺盛，且至少有一款产品将拥有极高的市场号召力。
Backtracking: everyone in the field knows that backtracking engines (PCRE, java, dotnet, javascript, PHP, ruby, python..) are bad because they are the poster child of denial of service attacks. O(2^n) match time complexity is not good. most backtracking implementations are a combination of clever optimizations duct taped to a very slow engine - for simple cases it works well, but using a pattern that is not affected by the optimizations, you get to see what the “real” worst-case behavior looks like.，详情可参考爱思助手下载最新版本
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