How to use regex in Selenium IDE target?

I have to validate current date in my test case with Selenium IDE and I research for a regular expression or a function to insert directly in my .side file to verify the date.

I tried to put regexp:(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d) (and other basic regex) in value or in target with verify text command and assert text command ..

But these are all not working...

So Please help me...