Hey,
the easiest way to this is: Regular Expression.
You can use regex101.com (https://regex101.com/) to create and test your regular expression on your specific body of text.
The text parser module will help you extract the specific information so you can request a file or page via the HTTP module. Here is the link to the documentation: https://www.make.com/en/help/tools/text-parser
Cheers,
Chris