How to test if Scala combinator parser matches a string

Posted by W.P. McNeill on Stack Overflow See other posts from Stack Overflow or by W.P. McNeill
Published on 2012-12-13T05:00:38Z Indexed on 2012/12/13 5:03 UTC
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I have a Scala combinator parser that handles comma-delimited lists of decimal numbers.

object NumberListParser extends RegexParsers {
  def number: Parser[Double] = """\d+(\.\d*)?""".r ^^ (_.toDouble)

  def numbers: Parser[List[Double]] = rep1sep(number, ",")

  def itMatches(s: String): Boolean = parseAll(numbers, s) match {
    case _: Success[_] => true
    case _ => false
  }
}

The itMatches function returns true when given a string that matches the pattern. For example:

NumberListParser.itMatches("12.4,3.141") // returns true
NumberListParser.itMatches("bogus") // returns false

Is there a more terse way to do this? I couldn't find one in the documentation, but my function sees a bit verbose, so I wonder if I'm overlooking something.

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