Scala RegEx Parser Demo

KeyValueParser.scala

import scala.util.parsing.combinator.RegexParsers

/**
 * Simple parser for a key value string like:
 * key01 = Value01 key02=value02 key03 =value03 key04= value04
 * 
 * The parser does not support whitespace in key or values.
 */
object KeyValueParser extends RegexParsers {
  
  def map = rep(mapping) ^^ {_.toMap}

  def mapping = word ~ "=" ~ word ^^ {
    case key ~ _ ~ value => key -> value
  }
  
  def word = "\\w+".r
  
  /**
   * Parse a key value text into a Map[String, String].
   */
  def parse(input: String) = parseAll(map, input) match {
    case Success(result,_)   => result
    case failure : NoSuccess => throw new Exception(failure.msg)
  }
    
}