How can we test user input? Is it valid email address? How to do these tests on App Inventor 2?

As you know every email address include @ and . symbols

Like – > NAME@DOMAIN.COM

So we can test it,is it include @ ? But we dont need to do, thanks Taifun for his Tools extension.With Taifun Tools extension we can test is it valid email address?

This block return true if email address is valid