Function isValid for URLs does not validate SharePoint/Office365 links properly

Issue

The following function returns false, but should return true:

Details

SharePoint/Office365 allows users to share items via URL. These generated URLs contain a simple combination of characters that are returned invalid by isValid. Example URL:

https://companyname.sharepoint.com/:f:/s/site-collection-name/subsite-name/Ds10TaJKAKhMp1hE0B_42WcBVhTHD3EQJKWhGprKFP3vpQ?e=14ohmf

In this example, the :f:, which denotes a shared folder, is considered invalid. Other example designations used by SharePoint:

• :w: for Word

• :x: for Excel

• :p: for PowerPoint

• :b: for PDF