The poster's name/email is similar to this <downloadthis> (which is the display name). And the email is similar to this [email protected]
*edit
I tried entering the name/email in the -"from poster" of the watch topic itself, but that didn't work either. Therefore the version using a filter.
I set up a watch topic, with a filter like this (using parts of the email and the name as a "accept if poster contains" filter):

But what I get as results looks like these posters, with addresses that have nothing to do with the search terms set in the filter.
What am I doing wrong and which approach would be better?