Please refer to our new email validation regex card.
Our most recent pattern is
EMAIL = /\A[a-z0-9\+\-_\.]+@[a-z\d\-.]+\.[a-z]+\z/i
[a-z0-9\+\-_\.]
with \w
! Otherwise the pattern would allow ß
s and many other invalid characters.a@a
is valid). In result our pattern is more strictly.john..doe@example.com
and john.doe@example..com
are accepted as well.