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SumOfUs/Champaign

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app/lib/email_validator.rb

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class EmailValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    if value && !value.match?(/\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i)
      record.errors[attribute] << (options[:message] || 'is not an email')
    end
  end
end