Grammar is destiny.
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Ken Thompson, perhaps one of the most well-known computer scientists of all time, created the grandfather of all regex algorithms in 1968, inspired by Brzozowski’s work, but only included OR (|) as a boolean operator. and somewhere in the process also changed the meaning of union to alternation by always choosing the left branch when both branches could match, but let’s skip ahead, we got plenty more tangents to avoid here.，这一点在PDF资料中也有详细论述
Фото: Илья Питалев / РИА Новости。PDF资料对此有专业解读