People have shared it here and on reddit a bunch of times because it's funny. I always found the pragmatic counter-answer about using regex and the comments about how brittle it is to parse XML properly assuming a specific structure to be much more useful.
>>Dangit+(OP)
How is it more useful? Even if you insist on using regex, you'd primarily use it to fix the HTML so that it can be parsed, not to use regex itself to parse HTML.