module ASIN
String
validation for ASIN
codes Ref: www.amazon.com/gp/seller/asin-upc-isbn-info.html
Public Instance Methods
asin?()
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# File lib/gtin_extras/asin.rb, line 4 def asin? return false unless length == 10 return true if gsub(/[^a-zA-Z0-9]/, '') == to_s false end