grepping in Ruby (crossplatform)

crossplatform-grepping

    grep_output = ""
    Dir.glob("public/**/**").select {|file| File.file?(file)}.each do |file|
      File.open(file, 'r').each_with_index do |line, index|
        grep_output += line if line.include?('I18n.t(') || line.include?('I18n.translate(')
      end
    end
    result = []
    result += grep_output.scan(/I18n\.t\('([\w+|\.+]+)'\)/) # captures I18n.t('a.key')
    result += grep_output.scan(/I18n\.translate\('([\w+|\.+]+)'\)/) # captures I18n.t('a.key')    
    result += grep_output.scan(/I18n\.t\(\"([\w+|\.+]+)\"\)/) # captures I18n.t("a.key")
    result += grep_output.scan(/I18n\.translate\(\"([\w+|\.+]+)\"\)/) # captures I18n.translate("a.key")    
    result.flatten