System.Xml.Tests.ExceptionVerifier.CompareMessages C# (CSharp) Method

        private void CompareMessages()
        {
            if (IgnoreMultipleDots && _expectedMessage.EndsWith("."))
                _expectedMessage = _expectedMessage.TrimEnd(new char[] { '.' }) + ".";
            _expectedMessage = Regex.Escape(_expectedMessage);
            _expectedMessage = _expectedMessage.Replace(ESCAPE_ANY, ".*");
            _expectedMessage = _expectedMessage.Replace(ESCAPE_NUMBER, @"\d*");

            // ignore case
            _expectedMessage = _expectedMessage.ToLowerInvariant();
            _actualMessage = _actualMessage.ToLowerInvariant();
            if (Regex.Match(_actualMessage, _expectedMessage, RegexOptions.Singleline).ToString() != _actualMessage)
            {
                // Unescape before printing the expected message string
                _expectedMessage = Regex.Unescape(_expectedMessage);
                _output.WriteLine("Mismatch in error message");
                _output.WriteLine("===== Expected Message =====\n" + _expectedMessage);
                _output.WriteLine("===== Expected Message Length =====\n" + _expectedMessage.Length);
                _output.WriteLine("===== Actual Message =====\n" + _actualMessage);
                _output.WriteLine("===== Actual Message Length =====\n" + _actualMessage.Length);
                throw new VerifyException("Mismatch in error message");
            }
        }