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by d66
1008 days ago
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negation (~α): strings not matched by α
difference (α - β): strings matched by α but not β
intersection (α & β): strings matched by α and β
exclusive-or (α ^ β): strings matched by α or β but not both
inclusion (α > β): does α matches all strings β matches?
equality (α = β): do α and β match exactly the same strings?
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