Custom Validation of a PowerAppsForm

[NigelP]

Hi

I want to use a regular expression to validate a field on a form.

I have Tried rules, I can set the condition, but I cannot set what happens next.

So can I set the error property of a card when the Regular expression is not met ?

Thanks

Nigel

[TopShelf-MSFT]

adding in @aorth to review

@TopShelf-MSFT