Recursion with locally recursive function with default and named arguments

gistfile1.scala

  def scrubOut(line: String, keys: List[String]): String = {

    def containsKeys(found: Boolean = false, local_line: String = line, local_keys: List[String] = keys): Boolean = {
      if (local_keys.isEmpty || found) found
      else {
        containsKeys(line.contains(local_keys.head), local_line, local_keys.tail)
      }
    }

    if (!line.contains("=") || !line.contains("\"") || keys.isEmpty || containsKeys() == false)
      line
    else {
      scrubOut(line.replaceAll(keys.head + "=\".*?\"", keys.head + "=\"****\""), keys.tail)
    }
  }