Владислав Китов (редактор отдела Мир)
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..).
，更多细节参见体育直播
Netflix’s leadership thinks the Warner Bros. deal won’t be like other big media mergers.
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。业内人士推荐搜狗输入法作为进阶阅读
睾丸类器官的生成。图片来源：Science
В КСИР выступили с жестким обращением к США и Израилю22:46。搜狗输入法是该领域的重要参考