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..).
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，这一点在电影中也有详细论述
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原魅族副总裁曾洋加盟小米集团公关部，任公关部副总经理，职级相当于原小米公关部总经理王化。前星纪魅族CMO、CTO则加入玄景AI眼镜。