ruby - get the ASIN number from amazon URL -

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given amazon product url, can either 

http://amazon.com/gp/product/asin/* http://amazon.com/*/dp/asin/* http://amazon.com/dp/asin/*

how scrap asin number url in ruby ? not @ writing regular expressions.

use should find match by:

scan(/https?:\/\/(?:www\.|)amazon\.com\/(?:gp\/product|[^\/]+\/dp|dp)\/([^\/]+)/)

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