Amazon Short URL RegEx
When you search amazon.com, it takes you to product pages that have a real long URL. It can be nice and short, so here's a little regular expression to shorten it.
Short URL: https://amazon.com/dp/0764584367
// Shorten an Amazon.com URL
RegEx: (?:https://(?:www\.){0,1}amazon\.com(?:/.*){0,1}(?:/dp/|/gp/product/))(.*?)(?:/.*|$)
Replace: https://amazon.com/dp/$1
A little code to change the URL in the clipboard.
string longurl = Clipboard.GetText();
string pattern = @"(?:https://(?:www\.){0,1}amazon\.com(?:/.*){0,1}(?:/dp/|/gp/product/))(.*?)(?:/.*|$)";
string replacement = "https://amazon.com/dp/$1";
string shorturl = Regex.Replace(longurl, pattern, replacement);
Clipboard.SetText(shorturl);
The way I'm using this is I have a little app and assigned to a hotkey so when I copy a long amazon.com url, I hit my hotkey and it's made short in the clipboard (using WinKey).
BTW, I am a very amateur regex coder so it may not be optimized. I use RegexBuddy to test and MSDN on RegEx as my reference.
Update (on 5/15/08): I've found several more test cases recently and have updated the regex code accordingly. The URLs are also 4 characters shorter now (www. not nessasary, duh).