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7
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1 |
abstract class Rexp
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2 |
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3 |
case object NULL extends Rexp
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4 |
case object EMPTY extends Rexp
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5 |
case class CHAR(c: Char) extends Rexp
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6 |
case class ALT(r1: Rexp, r2: Rexp) extends Rexp
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7 |
case class SEQ(r1: Rexp, r2: Rexp) extends Rexp
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8 |
case class STAR(r: Rexp) extends Rexp
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