class Gem::Commands::DependencyCommand

def name_pattern args
  args << '' if args.empty?
  if args.length == 1 and args.first =~ /\A\/(.*)\/(i)?\z/m then
    flags = $2 ? Regexp::IGNORECASE : nil
    Regexp.new $1, flags
  else
    /\A#{Regexp.union(*args)}/
  end
end