How to block from indexing URLs that end with numbers in robots.txt?

Question

Search Engine Optimization

On the site, you can access products using different links, so you need to prohibit duplicates from indexing.
How to block URLs that end with numbers from indexing? site.ru/item/1081261/ with and without slashes (can be either 5 or 6 or 7 digits) and leave site.ru/item/1081261/dnevnik-sportivnoy-devochki-v-korobke-na-magnitah open for indexing -s-lentami

Answer 1

no way, robots is very primitive and can only nest directories
i.e. site.ru/item/* - please
put this from unwanted canonical pages to the correct ones

Answer 2

301 redirect by User-Agent and that's it.