Gem::Commands::DependencyCommand#name_pattern

# File tmp/rubies/ruby-4.0.0/lib/rubygems/commands/dependency_command.rb, line 196
def name_pattern(args)
  return if args.empty?

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