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progs/app03.scala
author Christian Urban <christian.urban@kcl.ac.uk>
Mon, 20 Oct 2025 22:18:21 +0200
changeset 1013 1a23d87d1700
parent 400 e4afe3f46c29
permissions -rw-r--r--
updated
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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abstract class Rexp
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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case object ZERO extends Rexp
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case object ONE extends Rexp
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case class CHAR(c: Char) extends Rexp
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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case class ALT(r1: Rexp, r2: Rexp) extends Rexp
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case class SEQ(r1: Rexp, r2: Rexp) extends Rexp
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case class STAR(r: Rexp) extends Rexp
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case class REC(x: String, r: Rexp) extends Rexp
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