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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前國家人權館館長、東吳大學政治系教授陳俊宏以「我們是自己故鄉的異鄉人」，來形容台灣社會對自身歷史的無知。他向BBC中文表示，台灣學生對曼德拉、馬丁路德金恩的故事耳熟能詳，卻未必真正理解發生在這片土地上的國家暴力，「這不是學生冷漠，而是整個公共知識結構長期缺席的結果。」。业内人士推荐旺商聊官方下载作为进阶阅读
18:29, 3 марта 2026Россия
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需要把 GitHub 等事件接到 Claude 做自动总结/审查的团队，详情可参考91视频
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