By default, if you insert a keyword, Groouply will find all posts and comments that have that keyword in them, exactly as you wrote it, alone or as part of a phrase.
All keywords are case insensitive.
No need to specify the case of a keyword.
demo will return posts that have Demo or dEmo
You can use spaces at the beginning, in the middle or the end of your keywords. You can use regular spaces, as well as the character "\s"