This regex deserves a downvote! If you don't undertand it (and i guess you don't if it's not written by hand) - don't never ever use it! The only way to valida

This regex deserves a downvote! If you don't undertand it (and i guess you don't if it's not written by hand) - don't never ever use it! The only way to validate a email adress is to send a validation mail/link.