NFAs are cheaper to construct, but have a O(n*m) matching time, where n is the size of the input and m is the size of the state graph. NFAs are often seen as the reasonable middle ground, but i disagree and will argue that NFAs are worse than the other two. they are theoretically “linear”, but in practice they do not perform as well as DFAs (in the average case they are also much slower than backtracking). they spend the complexity in the wrong place - why would i want matching to be slow?! that’s where most of the time is spent. the problem is that m can be arbitrarily large, and putting a large constant of let’s say 1000 on top of n will make matching 1000x slower. just not acceptable for real workloads, the benchmarks speak for themselves here.
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“十五五”时期是基本实现社会主义现代化夯实基础、全面发力的关键时期。习近平总书记指出：“坚持以经济建设为中心，完整准确全面贯彻新发展理念，实现质的有效提升和量的合理增长，推动经济持续健康发展和社会全面进步。”这充分体现了我国在世界动荡加剧、国际经济贸易秩序遭遇严峻挑战、大国博弈更加复杂激烈的世情下，集中精力做强国内经济的坚定决心；进一步明确了实现质的有效提升与量的合理增长相统一，把“蛋糕”做大做好的经济发展导向；是统筹国内国际两个大局，确保基本实现社会主义现代化取得决定性进展的战略考量。在推进社会主义现代化的关键时期，以人民为中心与以经济建设为中心被赋予更具时代性、创新性的内涵，使两者的有机统一更加紧密、更富现实意义，具体表现为以下几个方面。