Is there a way to use a reusable constant or expression rules instead of char(10) or char(13) function?

Question

Is there a way to use a reusable constant or expression rules instead of char(10) or char(13) function directly in any expression/interface rules? 
 Example Code: 
 a!richTextDisplayField( label: "", labelPosition: "COLLAPSED", value: a!richTextItem(text: "Hello " & char(10) &"world") ), 
 
 I need to replace Char(10) here with either a constant or expression rule, thanks.

Mike Schmitt · Answer

niharika s said: I think we can use an expression rule and use it as below 
 yes, your suggested code should work. Expression rules don't have to contain very much, as in your example. Out of curiosity, is there a reason you don't want to just have "char(10)" in your code?