REGEX_MATCH for validating date format

Question

I've made a control where end-user inputs date. I want to add a warning that would prompt whenever format is wrong.

The only accepted is "mm/d/yyyy". I tried to built and expression with regex_match but have challenge to combine functions into one solid expression.

marcin2x4 · Accepted Answer

I modified the function to allow only one specific format "mm/d/yyyy" and only first day of month.

Also switching the 1,0 arguments at the end of IIF fixed the issue I had that whenever I entered different format alteryx still allowed it to be entered.

Below code works perfectly!

Thanks @MarqueeCrew for your help! I finally made first step in understanding the regexp syntax ;)

IsEmpty([#1])
or 
IIF(regex_match([#1],"(0[1-9]|1[0-2])\/([1]|[12]\d|3[01])\/[12]\d{3}"),0,1)