Ctrl ⌘ Gselects all occurrences of the template in the current Mac file in Sublime Text 2. Thus, in your example, you can point the cursor to any instance Hey(without explicitly selecting it), and the call Ctrl ⌘ Gwill select each instance Heyin your file. You can then delete all of them at a time and re-add one instance.
Ctrl ⌘ G, . . , ⇧ ⌘ F . , .
, Hey Ctrl ⌘ G, , - , they , Hey.