Simple Ifconfig Parser in Ruby

ifconfig.rb

    class IfconfigParser

      MAC_REGEX = /^(\S{1,2}:\S{1,2}:\S{1,2}:\S{1,2}:\S{1,2}:\S{1,2})?$/

        # NOTE: this has some slightly weird results for wlan interfaces. Really meant to be used for eth0
        def self.ifconfig(iface)
          output = Hash.new
          ifconfig_string = `ifconfig #{ iface }`
          ifconfig_string.gsub!("RX ", "RX_")
          ifconfig_string.gsub!("TX ", "TX_")
          ifconfig_string.gsub!(" (", "_(")
          raw_array = ifconfig_string.split(' ').grep(/:/)
          output["HWaddr"] = raw_array.grep(MAC_REGEX)[0]
          output["ipv6_addr"] = ifconfig_string.split("\n").grep(/inet6/)[0]
          output["ipv6_addr"] = output["ipv6_addr"].split[2] unless output["ipv6_addr"] == nil
          hash_array = raw_array.map {|e| e.split(':') }
          hash_array.reject!{|e| e.length != 2 }
          hash_array.inject(output) do |output, element|
            output[element[0]] = element[1]
            output
          end
          output
        end

    end