Hi,
This will do.
Use system expression mid(Text,Index,Length) to get what you need.
where...
Text - text you want to be checked.
Index - where program should start from seeing the word. In our case we have to search for it with system expression find(Text,Find)
Length - we use expression len to calculate length of text you want to be found so only this word would be shown. So in case of "MultikillGladiator" we will get "kill" , not "killGladiator"
You can use it in actions too.