private void MatchButton_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            var pattern = Pattern.Text;

            if (_regexValidator.IsValid(pattern))
            {
                var input   = Input.Text;
                var matches = _matcher.Match(pattern, input);
                Matches.Text = matches.ToString();
            }
            else
            {
                Status.Text = _regexValidator.ValidationMessageFor(pattern);
            }
        }