# File lib/Getopt/Declare.rb, line 512
    def Arg.posflagpat(*t)
      if !@@posflagpat && @@flags
        @@posflagpat = '(?:' + ( @@flags.map { |i| 
                                  Regexp::quote(i) } ).join('|') + ')'
      else
        @@posflagpat
      end
    end