Unfortunately rutorrent RSS is very limited. If you want size control you should check autodl-irssi, but for now it's better to learn the RSS basics and then move forward.
The following filter used in the Exclude option will not download anything bigger than 10GB

/\d{2,}\.\d{2,}\s*GB/i


Edit: Just had a look at IPT RSS feed and it seems that they offer the size limitation during the RSS setup.

https://iptorrents.eu/getrss.php

You can choose 0 to 5GB and select your categories.
Using this in the "Filter" option will download everything

/.*/i

Originally Posted by doctor

Roger that ! But what about the exceptions ? Is there an easy way to add any exception ?
#Example - If i ll let the seedbox add any torrent (lets say for a day or two) it will probably end up with no HDD space very soon ! (especially on IPT where lots of new torrents appear very fast and in random sizes )
Talking about sizes ,is there an exception to avoid huge or even big torrents ,so the seedbox whont run out of space ,and probably end up paused ?
Thanks for your useful info so far !
Very appreciated and helpful for a starter on RSS like i am .