Email validation update with regex PR

[eureka928]

Describe the bug

Hi @abi ,

I'd like to contribute with one PR for email validation update.

No PR will be accepted?

Thank you for your time

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Screenshots of backend AND frontend terminal logs
If applicable, add screenshots to help explain your problem.

[abi]

For the most part, I don't have the time to accept PRs to this repo.