What is the best/easy way to validate an email address in Ruby?

Question

What is the best/easy way to validate an email address in ruby (on the server side)?

Answer 1

If you are using Rails/Devise - addition to @apneadiving`s answer -

validates_format_of :email,:with => Devise::email_regexp

Devise::email_regexp is taken from config/initializers/devise.rb

config.email_regexp = /\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/