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.
Zachary Hart, Stereophonic
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Малышева отчитала гостью ее передачи и предрекла ей инсульт14:53
Defining the Heisei Era (The Japan Times, 2018–2019):