gistfile1.rb

 class Address
    def initialize address, display_name, domain
      @address = address
      @display_name = display_name
      @domain = domain
    end

    attr_reader :address, :display_name, :domain

    def self.from_header h # returns an Array of Addresses
      parse_multi_address h
    end

    private

    def self.parse_multi_address string # splits address lines into multiple emails
      return [] if string.nil? || string !~ /\S/
      emails = string.gsub(/[\t\r\n]+/, " ").split(/,\s*(?=(?:[^"]*"[^"]*")*(?![^"]*"))/)
      emails.map { |e| parse_address e }.compact
    end

    def self.parse_address string # ripped from sup
      return if string.nil? || string.empty?

      name, email, domain = case string
      when /^(["'])(.*?[^\\])\1\s*<(\S+?@(\S+?))>/
        a, b, c = $2, $3, $4
        a = a.gsub(/\\(["'])/, '\1')
        [a, b, c]
      when /(.+?)\s*<(\S+?@(\S+?))>/
        [$1, $2, $3]
      when /<(\S+?@(\S+?))>/
        [nil, $1, $2]
      when /(\S+?@(\S+))/
        [nil, $1, $2]
      else
        [nil, string, nil] # i guess...
      end

      Address.new email, name, domain
    end
  end