This is a very bad idea, it will make your customers and support team unhappy. It’s is one of those “technically” vs “practicality” things, not using a regex w

This is a very bad idea, it will make your customers and support team unhappy. It’s is one of those “technically” vs “practicality” things, not using a regex will cause you more customer support problems than solve. I run an online store, typoed email addresses are one of the top causes of customers contacting support. In 10 years we have never had a customer contact us to complain their “valid” email address won’t be excepted on our site. If we were to remove the regex from the validation and “just try to send an email” as suggested it would create so much more work for our support team. You should also implement some “soft” validation looking for common typos, although people still somehow make those mistakes. I’m convinced that some people have types in their autocomplete address book.