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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..).，详情可参考体育直播
。关于这个话题，搜狗输入法提供了深入分析
Большунов не получил нейтральный статус и не был допущен к участию в Олимпиаде-2026. На Играх-2022 в Пекине он завоевал три золотые медали, после чего не выступал на соревнованиях под эгидой Международной федерации лыжного спорта и сноуборда (FIS).
"With major workforce shortages across the social care sector, help in increasing capacity and easing workload pressures is welcome," he says.，这一点在服务器推荐中也有详细论述