# File lib/snmp/mib.rb, line 123
        def list_imported(regex=//, mib_dir=DEFAULT_MIB_PATH)
            list = []
            Dir["#{mib_dir}/*.#{MODULE_EXT}"].each do |name|
                module_name = File.basename(name, ".*")
                list << module_name if module_name =~ regex
            end
            list
        end