<monkey[m]> "Here are the lines in MB..." <- monkey: To follow up on this, I think `amazon\..*?/(?:\..*?/)*?([A-Z\d]{10})` and `^[A-Z\d]{10}<monkey[m]> "Here are the lines in MB..." <- for validation will work best for Amazon ASIN parsing. We currently allow lowercase letters for the ASIN, but I'd recommend against that. Assuming the first characters will be `B0` or the entire ASIN will be numbers except for possibly the last
letter, which could be an `X`, doesn't seem necessary for BB because we always parse ASIN's from a URL and don't do any checking to try to detect ASIN's being used as barcodes like in MB. And, without documentation from Amazon, I doubt we can assume that `B0` will always start an ASIN or it will be all numbers, possibly ending with the letter `X`. The only potential problem with the regex is where the URL contains a product name
of exactly ten alphanumeric characters, i.e. "https://www.amazon.com/0123456789/dp/B0CN7WK3JJ" will parse `0123456789` as the ASIN instead of `B0CN7WK3JJ`. This is part of the reason why I think it's better to require capital letters for the ASIN, as it makes this situation less likely.
