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.
Фото: Ilya Moskovets / URA.RU / Globallookpress.com
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issue for it in April
他将影响一次性内裤“干净”的核心因子，拆解为面料、手触、细菌、灰尘四个维度，最终的解决方案指向一个行业还未实现过的目标 —— 纯棉材质的全流程自动化生产。
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