Here you see some text completions with case sensitivity off, and "." included as a connecting characater in the preferences. That is why possible.impossible is a valid completion, but possible*impossible is not. If we add * to the list of characters on the preference page, that will become a completion.

Here is an example which shows "raw" template completions. Since several template names begin with "f", they appear as completions. The second image shows the filecomment template after it is inserted.