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object Test extends scala.util.parsing.combinator.RegexParsers {
def sign = "-"
def number = "\\d+".r
def p = sign.? ~ number withErrorMessage "Number expected!"
def q = sign.? ~! number withErrorMessage "Number expected!"
def main(args: Array[String]) {
println(parseAll(p, "-x"))
println(parseAll(p, "x"))
println(parseAll(p, "-5"))
println(parseAll(p, "5"))
println(parseAll(q, "-x"))
println(parseAll(q, "x"))
println(parseAll(q, "-5"))
println(parseAll(q, "5"))
}
}
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