I would love to be able to set a Regular Expression (for a format string) on an input textbox like "###-##-####" for SSN or "(999) 999-9999" for a telephone number. I was directed to post my suggested idea here as I understand that Power Apps does not yet support formatting regular expressions.
Thanks and keep up the great work with this excellent app.
As a side note, I did see a suggestion to NOT include all of a sharepoint's list items when connecting to a list as I currently am working on one that has 72 items and it takes a while to load up.
Updating status and adding @FilipK