Excel Version 2013/2016

I used a PowerShell Script to extract from a folder structure all folder names, filenames, and subfolders. Then I broke that into multiple columns. C to F are the ones I'm concerned about. These particular folders cannot contain a list of special characters. i.e. #, $, ', ", %, ., etc. One thing that makes it difficult is I have to search for periods. Not periods can be in the file or folder names other than the period before the file extension.

I think I need 2 conditional formatting rules, one that uses the list of special characters and another that looks for periods in file and folder names that don't belong.

To give you an idea of the second issue with the periods.

Folder names:
Arch. Rev. 2 06-03-17

Filenames
Arch. Drawing No. 03.pdf

Thank you