The result is:
Explanation: Since the filter excluded the Photo folder, all the files inside it will not be included in the backup. While everything else will be included since the Include all unmatched files/folders box is checked.
The result is:
Explanation: Only excel files that start with lower case letter a will be included in the backup. As you can see only files that start with lower case letter a will be backed up because the filter for regular expressions are case sensitive. So, the files starting with upper case letter A will not be included.