I'm trying to perform a whole word search in javascript using the following regex.

str = Test String C.S (example);

var regex_search = new RegExp(\b+search_string+\b,g);

if(str.match(regex_search)) != null)

  match = true;

else

  match = false;

The above works well if I search for a normal string like 'String'. But if I search for just 'S', it returns C.S as a match. Also, searching for example returns a match but in this case I do not want a match because it has parenthesis. I just want to match the whole word only. Any suggestions would be greatly appreciated.

--Edit--

Thanks to @plalx Clarified the example.