See Re: How to extract text present in 3 lines within the HTML tags as an example for how to use the XML::Twig module to parse HTML input. This isn't the only perl module you could use, but let's stick to it for now. That answer also shows how to extract text inside a HTML element once you've found the element.
Now you just need one more piece to solve your problem. You have to find the right element, which isn't just any div element, but the div element with the particular id attribute. For that, look at the documentation of the XML::Twig module for a method of XML::Twig that returns an element of a particular id. If you can't find it, look at the hint under the fold.
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