Derekokich
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| def repeat: Parser[RegexExpr] = lit <~ "*" | |
| ^^ { case l => Repeat(l) } | |
| def plus: Parser[RegexExpr] = lit <~ "+" | |
| ^^ { case p => Plus(p) } | |
| def lowExpr: Parser[RegexExpr] = repeat | plus | lit |
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| def parenExpr: Parser[RegexExpr] = "(" ~> highExpr <~ ")" | |
| def lit: Parser[RegexExpr] = charLit | parenExpr |
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