[Box Backup] ExcludeFilesRegex on Windows

[Robert B]

Does ExcludeFilesRegex allow backslashes on Windows?  I.e., do I need a backslash to exclude only files?  E.g.,

ExcludeFilesRegex = .*\foo.bar

or is this sufficient?:

ExcludeFilesRegex = .*foo.bar

Also, does the period/dot/extension need to be backslashed?:

ExcludeFilesRegex = .*foo\.bar

Thanks.