圖像來源，Getty Images
Трамп призвал не бояться роста цен на нефть02:56。新收录的资料对此有专业解读
ВВС США купят броневики для ядерных «Минитменов»02:00。新收录的资料对此有专业解读
Milliseconds since Unix epoch
of course this rabbit hole goes deeper, and we have a paper using this technique for string constraint solving that i’d love to derail this post into, but i’ll save that for another time. the main point is that symbolic derivatives are a more powerful and efficient generalization of Brzozowski’s original idea, and they form the core of the new RE# engine. fun fact: symbolic derivatives are also implemented in Z3 (the SMT solver) for its sequence theory - so in some sense we’re inching closer to having an SMT solver’s core machinery inside a regex engine.