regex to valid filepath

The above regular expression only validates full paths i.e. paths which include a file name.

So it wouldn't validate c:\temp\ for example.

However, the following would validate paths which don't include a file name:

   string regExp = @"^(?:[A-Za-z]\:|\\)(\\[a-zA-Z_\-\s0-9\.]+)+\\$";

How to validate if the string has a filename along with the path review below.

I am looking for a regex that validates if the string has a filename along with the path review below.


Example:

C:\temp\ Incorrect because of ";" Incorrect

C:\temp\example.txt  Correct