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..).
Иран надеется, что благодаря этому пошатнутся электоральные позиции республиканцев на предстоящих выборах в Конгресс, и такая угроза заставит Трампа изменить поведение, заключил он.
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Keep use_gradient_checkpointing="unsloth" on (it’s designed to reduce VRAM use and extend context length).，详情可参考Safew下载
以前我们学的是「这个API怎么用」，以后我们学的是「这个需求怎么拆」。