Implement proper email validation

[octopusinvitro]

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The internet and the different gems out there don't seem to agree on which is the ultimate regex to validate emails:

%r{/\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/},

%r{/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/},

%r{/\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i},

%r{/^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4},*[\W]*)+$/},

%r{/\w+@\w+\.{1}[a-zA-Z]{2,}/}

# ... and more...

Find a way to validate emails properly, etiher with regex or something else