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..).
4. 从后向前遍历原数组，按count位置放入结果数组
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王天：这些是穿戴类消费电子产品的共性问题，就像用户希望手机屏幕大、重量轻、续航久一样，我们也希望产品越轻越好。但C端外骨骼产品的核心指标，很大程度上依赖于供应链，在行业技术路线没有颠覆性改变的情况下，各家产品的重量差异并不大，无非是百克级的差别。。关于这个话题，heLLoword翻译官方下载提供了深入分析
One of the members of Anthropic's board of directors appointed by the LTBT is Reed Hastings. I've not been able to find evidence that he cares about AI x-risk or safety a notable amount.