Improve email address regex
Improve email address regex

An email address of the form "a.-b@doma.in", although valid, was not previously accepted.

lukasjuhrich/pycroft,agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,agdsn/pycroft,lukasjuhrich/pycroft,lukasjuhrich/pycroft