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    <h1>Update, 2017</h1> <p>@Leonid commented that he’s found the ASIN <code>BT00LLINKI</code>.</p> <p>Although ASIN’s don’t seem to be strictly incremental, the oldest non-ISBN ASINs do tend to have more zeros than newer ASINs. Perhaps it was inevitable that we’d start seeing ASINs with no zero padding (and then what, I wonder...). So we’re now looking for "B" followed by nine alphanumeric characters (or an ISBN) — unfortunately, the "loss" of that zero makes it a lot easier to get a false positive.</p> <pre><code>/^B[\dA-Z]{9}|\d{9}(X|\d)$/ </code></pre> <hr> <h1>Original answer</h1> <p>In Javascript, I use the following regexp to determine whether a string is plausibly an ASIN:</p> <pre><code>/^\s*(B\d{3}\w{6}|\d{9}(?:X|\d))\s*$/ </code></pre> <p>or, without worrying about extra whitespace or capturing:</p> <pre><code>/^B\d{2}\w{7}|\d{9}(X|\d)$/ </code></pre> <p>As others have mentioned, Amazon hasn't really revealed the spec. In practice I've only seen two possible formats for ASINs, though:</p> <ol> <li>10-digit ISBNs, which are 9 digits + a final character which may be a digit or "X"</li> <li>The letter B followed by two or three digits followed by six or seven alphanumeric characters</li> </ol> <p>If anyone has encountered an ASIN that doesn't fit that pattern, chime in. It may actually be possible to get more restrictive than this, but I'm not certain. Non-ISBN ASINs might only use a subset of alphabetic characters, but even if so, they do use most of them. Some seem to appear more frequently than others, at least (K, Z, Q, W...)</p>
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    1. PODetermine if 10 digit string is valid Amazon ASIN
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    1. COGood thing to note it is indeed a "plausible" ASIN :-).
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    2. COIndeed, @Styxxy -- I think that's really what the question meant. Of course, there's no way to know whether the possible ASIN is in use without asking Amazon, but you can at least know that it's worth checking in the first place. If the Product Advertising or MWS Product APIs are too heavy for one's needs, then Flurin's answer remains solid. DSA's concerns are fortunately something most people can ignore. Without going into tons of detail, you actually *can* assume that one ASIN never points to two completely different products. Exceptions exist, but are quite rare (and are errors).
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    3. CO(Though, to be clear, the existence of an ASIN on one marketplace says nothing of whether it exists on another.)
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