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..).
Ранее президент США Дональд Трамп заявил, что Вашингтон может вечно воевать из-за внушительного количества запасов вооружения. По его словам, запасы боеприпасов среднего и большого калибра никогда не были такими обширными и качественными.。WPS下载最新地址对此有专业解读
Студенты нашли останки викингов в яме для наказаний14:52。业内人士推荐服务器推荐作为进阶阅读
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A common sentiment expressed by readers is that the language starting from 1200 AD is a foreign and incomprehensible. I am not sure I would agree. While Old English absolutely requires some effort to learn, I think with a little analysis it is much closer to Modern English than we think - and certainly closer to that than it is to say, Modern German.