You can always paste the code into one of your already uploaded torrents to see if it works.
- copy the torrent's description
- archive it somewhere in a text file
- paste in the description you want to test out into the sandbox
- save, check it see if it's working
- copy and paste the other description into the sandbox.
And when I talk about sandbox then it's of course not:
http://bakabt.me/sandbox.phpBut the one you can access when you already have an uploaded torrent.
But make sure you back-up then description before clicking save.