I did a search and I saw that I could use
pattern="^\d{4}-\d{3}-\d{4}$" required >
But, I thought that there was a way to get a validation error as soon as they leave the field, without having to click on a submit button. Is it possible to do this without JS?
Is can lowercase uppercase and numbers from 1 to 15 chars after that need a at character after that a domain name max 15 char after that need a dot and from 1 to 15 for .tld like .com net or longer.