“制造、物流、商服、养老等领域的真实需求巨大，但落地常见‘场景碎片化、验收口径不一、预算与迭代机制不足’，导致企业在‘项目制交付’与‘产品化复用’之间反复摇摆。”贺晗还谈到，目前场景的牵引力不强，“示范应用”难自然长成“持续采购”。
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.
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