Thomas Dohmke ex CEO, GitHub
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..).
，更多细节参见爱思助手下载最新版本
AI，教育，下一代……这几个关键词在这特殊时机与场合的缠结，成了阿里技术观的观察切口，也成了阿里价值观的直观投射。。关于这个话题，旺商聊官方下载提供了深入分析
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