# File src/ruby_supportlib/phusion_passenger/admin_tools/instance_registry.rb, line 75
      def find_by_name_prefix(name, options = {})
        prefix = /^#{Regexp.escape name}/
        results = list(options).find_all { |instance| instance.name =~ prefix }
        if results.size <= 1
          return results.first
        else
          return :ambiguous
        end
      end