The {VALUE} in the above question is not an environmental variable, at least in perl. If it were, and it were called VALUE, you'd be able to read and write it in $ENV{VALUE}.

I'm not sure what you mean by dumping the var=value pairs from the returned page. Is the page a series of links with pairs in the URLs as given in your example? If yes, you'd have to write a regex to parse and retrieve them.

Could you give a better description of the content of the returned page? From there it's much easier to describe how to turn it into a series of keys and values.