Input validation for date XX/MM/YYYY

Good morning, which formula do I use here for input data validation in DD / MM / YYYY format, because Input validation - AppGyver, not help me, thanks?

Hi, you can use MATCHES_REGEX() formula with a regular expression to validate the date input.

You can find regex patterns for date formats here:

Thank you so much for your help, but I did exactly what the link Input validation - AppGyver asks for, and it didn’t work. Please, what do I need to do to make this simple example work? Thanks

Good morning, I made the changes as directed, but unfortunately it didn’t work, please see the photo to see if I did everything right. Thank you so much.