a very common use case for regexes is to find matches that are preceded or followed by some context. a classical example being all lines that end with ‘a’. this requirement is usually expressed with a lookahead, where upon finding an ‘a’, you look ahead to check if it’s the end of the line. in a backtracking engine, this is very easy to implement - you just duct-tape the logic that checks the next character, but in a DFA-based engine, this is impossible because you cannot report “the match is here” if the next character is not even known yet. and by the time you know the next character, the position information is lost, so you can’t report the match retroactively (well, unless the distance is fixed of course..).
Малышева отчитала гостью ее передачи и предрекла ей инсульт14:53
，这一点在体育直播中也有详细论述
Best new entertainment or comedy play
Александра Синицына (Ночной линейный редактор)
推演：如果“文化即代码”无法规模化，那么2026年之后，硅谷这批独角兽将面临一道分水岭：要么找到“精英主义+适度流程”的平衡点，成为下一代微软/谷歌；要么卡在2000人规模，成为被收购的对象。