wisher06 wrote:I don't
figure out the regex pattern underlying this
url.
Neither do I. Who knows what the different numbers mean, other than the developers of the software that website is using? It's obviously not as clear as a link such as article.php?id=123456, but then again that doesn't really matter to us, the end-user. All that matters is that the software that they wrote can understand that link perfectly fine.
And in the end, that's all that you should really care about, too. Perhaps the URL should give some information about the contents that it links to, but then again maybe not.
A URL for a webpage is like a street address in my mind; a street address can tell you exactly where to find someone's house, but it doesn't describe the house to you in any way. There are numerous other elements that you should be concerned about in terms of search engine ranking; the URL shouldn't play a big part, but rather the content behind the URL.