HelpHow can i do this?

regex for email: \b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b

Emails would be easier unless there's a certain structure in the site. A pretty simple regex should work well enough for that kind of task, as suggested earlier.

1. Download the source code of the site, or open it in a rendering engine (like Webkit).
2. Find the emails in the source using the regex, using a regex engine. I think at least Boost includes one, and I've used Qt's engine before so it definitely has one. I'm sure there are others, too.

As of C++11, regular expressions are supported in the standard library and can be found in the header <regex>.