URL filtering


This patch adds URL filtering support to surf, for example to remove advertisements. The file filters contains POSIX regular expressions (see the re_format(7) manpage). If a HTTP request is about to be made for a URL that matches any of the expressions in the file, it is replaced with about:blank instead. This may lead to slightly broken display on pages that expect e.g. images to load correctly. The impact is negligible though.


An example list of filters looks like this: