Scala Parser, trying to parse regexp

RuleParser.scala

package csvvalidator

import scala.util.parsing.combinator.syntactical.StandardTokenParsers
import scala.io.Source;

/**
 * Adam Retter
 */
object TestProblemParser extends StandardTokenParsers {

	def main(args: Array[String]): Unit = {
		//left side of first : should be an identifier e.g. anything except whitespace or eol
		//right side of first : should be an unescaped regular expression
		TestProblemParser.test("file_path: [A-Z][0-9]{3}:[0-9]")
	}
	
	
	
  lexical.delimiters += ("@", ":")
  
  def Expr = ColumnRuleExpr+
  
  def ColumnRuleExpr = (ColumnIdentifierExpr <~ ":") ~ ColumnValidationExpr
  
  def ColumnIdentifierExpr = ident;
  def ColumnValidationExpr = elem("regexp", (p: Elem) => !p.chars.contains("""\s"""))
  
  
  
  def parse(data: String) = {
    val tokens = new lexical.Scanner(data)
    phrase(Expr)(tokens)
  }
  
  //Simplify testing
    def test(exprstr: String) = {
        parse(exprstr) match {
            case Success(tree, _) =>
                println("Tree: "+tree)
                //val v = tree.eval();
                //println("Eval: "+v)
            case e: NoSuccess => Console.err.println(e)
        }
    }
}