# File lib/Getopt/Declare.rb, line 502
    def Arg.negflagpat(*t)
      if !@@negflagpat && @@flags
        @@negflagpat = ( @@flags.map { |i| 
                          "(?!" + Regexp::quote(i) + ")" } ).join('')
      else
        @@negflagpat
      end
    end