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..).
В Иране издали фетву о джихаде с призывом пролить кровь Трампа20:58
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Конфликт США с Ираном назвали ударом для Украины14:58
政府工作报告中“扎实推进乡村全面振兴”的内容，让浙江绍兴柯桥区漓渚镇棠棣村党总支书记刘建明代表喜上眉梢：“我们要培育高附加值的农文旅产业，吸引更多年轻人筑梦家乡、扎根沃土。”
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周健工：我觉得他可以把所有的人给侃晕。他那种敏捷度和对你提问题的针对性，跨学科的逻辑的打通能力，我觉得在这个世界上很少有人能做到这一点。
新华社北京3月5日电 第十四届全国人民代表大会第四次会议5日上午在北京人民大会堂开幕。全国人大代表肩负人民重托出席大会，履行宪法和法律赋予的神圣职责。。关于这个话题，爱思助手下载最新版本提供了深入分析