     
     // MARK: Action Messages
     
-    ///
-    @IBAction func highlight(_ sender: AnyObject?) {
+    /// highlight all matches in the target textView
+    @IBAction func highlight(_ sender: Any?) {
         
         self.endEditing()
         self.validateObject()

            else {
                NSSound.beep()
                return
        }
        
        guard let batchReplacement = self.representedObject as? BatchReplacement else {
            assertionFailure("No batchReplacement object is set.")

    
    
    /// reset previous search result
    override func viewDidDisappear() {
        
        super.viewDidDisappear()
        
        self.resultMessage = nil
    }
