In the shortcuts section of the text shortcuts settings, when trying to add a shortcut, samsung does not allow any symbols or special characters, I think this is non-intuitive. Especially considering Apple allow you to put anything in the shortcuts section.
For example; I want to shortcut my email address. So instead of typing it all out I wish to shortcut my email address by typing in the @ symbol twice, for example. Samsung will not allow this as the shortcut I would want to use is a symbol/special character.
@Akibak1993: Sorry to hear of your disappointment. As you mentioned, shortcut phrases must contain letters or numbers to access the assigned expanded phrase, however I will pass your comments to our Research and Development Team to see if special characters can be implemented as shortcuts in future products or updates. In the meantime, you may wish to assign a numerical text shortcut to your email address as a workaround. I hope this helps.