Question

I have the following test which aims to ensure that file path generated is of a specific format. Using Nunit’s fluent interfaces, how can I go about this?

I am having trouble with the regex.

  [Test]
    public void AssetControlPath_ShouldHaveFormat_BaseDir_YYYY_MMM_YYYYMMMDD() 
    {
        //Arrange
        var baseDir = "C:\\BaseDir";
        var fpBuilder = new FilePathBuilder(new DateTime(2010,10,10), baseDir );

        //Act
        var destinationPath = fpBuilder.AssetControlPath();

        //Assert
        // destinationPath = C:\BasDir\2010\Oct\20101010
    Assert.That(destinationPath, Is.StringMatching(@"C:\\BaseDir\\d{4}\\[a-zA-Z]{3}\\d{8}"));              
    }

The unit test error
XXX.FilepathBuilderTests.AssetControlPath_ShouldHaveFormat_BaseDir_YYYY_MMM_YYYYMMMDD:
Expected: String matching "C:\\BaseDir\\d{4}\\[a-zA-Z]{3}\\d{8}"
But was: "C:\BaseDir\2010\Oct\20101010"

Edit:
I have actually switched the test to use @ChrisF’s approach. The question however still stands.

Answer 1

@"C:\\BaseDir\\d{4}\\[a-zA-Z]{3}]\\d{8}"
//                              /\ extra bracket

Also you have a problem with \ escaping, you need \\\d{4} and \\\d{8}, you want to match xxx\20101010 and not xxx20101010. The following fix matches correct:

var str = @"C:\BaseDir\2010\Oct\20101010";
var re = new Regex(@"C:\\BaseDir\\\d{4}\\[a-zA-Z]{3}\\\d{8}", RegexOptions.IgnoreCase);
var result = re.IsMatch(str); // true