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and the magic here is that we can do this with zero back-and-forth movement. we find the matches with two linear scans, one right to left to mark exactly where the matches start, and one left to right to eliminate overlap. right to left sweep marks all matches in a single pass. it’s completely deterministic, every possible future has been accounted for, and we just let the automaton do its thing.
，这一点在夫子中也有详细论述
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45，详情可参考旺商聊官方下载
Владислав Китов (редактор отдела Мир)
in RE#, we solve this by encoding the context information in the state itself. below, you can see the state machine for the regex ab(?=cd), which matches an ‘ab’ only if it’s followed by a ‘cd’. encoded in the final state, is the information that the match actually happened two characters ago.