marking4/re_test6.scala
author Christian Urban <christian.urban@kcl.ac.uk>
Sat, 31 Oct 2020 16:47:46 +0000
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import CW9c._
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val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))
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assert(simp(Iterator.iterate(ONE:Rexp)(r => SEQ(r, ONE | ONE)).drop(50).next) == ONE)
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assert(simp(Iterator.iterate(ONE:Rexp)(r => ALT(r, r)).drop(20).next) == ONE)
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assert(matcher(EVIL_urban, "a" * 1000000) == false)
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assert(matcher(EVIL_urban, "a" * 1000000 ++ "b") == true)