format_string(str) private

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# File lib/net/imap.rb, line 2483
      def format_string(str)
        case str
        when ""
          return '""'
        when /[\x80-\xff\r\n]/
          # literal
          return "{" + str.length.to_s + "}" + CRLF + str
        when /[(){ \x00-\x1f\x7f%*"\\]/
          # quoted string
          return '"' + str.gsub(/["\\]/, "\\\\\\&") + '"'
        else
          # atom
          return str
        end
      end
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