By default, the search and replace in Vim replaces the search string even if it is a substring in a longer string. For example,
:%s/foo/abracadabra/ will replace
foo that is in
zoofoomoo(20). However, while working with source code we typically want to replace only those occurrences where the search string appears as a whole word.
To do this in Vim, enclose the search string as shown in:
Tried with: Vim 7.4 and Ubuntu 14.04