I contacted GFI support and forum, they claim it's possible to filter emails containing URL only, no text before and after. But it seems to be not working, to me it looks as the regular expression engine they use check line by line, not applying regular expression to the entire body text. If you use GFI MailEssential, how do you overcome this limit?
For example, when I tried to filter emails containing only URL, not text before and after with/without new line character, I put this;
But it filters both 'text + e', 'e+text', text+e+text'. The ^ and $ is only applied to line, not entire text, looks like...