Editing String replace methods

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

var str = (new Array(1000)).join("test 1 2 3 4 5 6   7 8  9 bar !"),
   search = "7 8",
   regexp = new RegExp(search, "g"),
   replace = "+";

function replace_while(str, search, replace) {
   while ( str.indexOf(search) > -1 ) {
      str = str.replace(search, replace);
   }
   return str;
}

function replace_substring(str, search, replace) {
   var result = "",
      index = -1,
      len = search.length;
 
   while ( (index = str.indexOf(search)) > -1 ) {
     result += str.substring(0, index) + replace;
     str = str.substring(index + len);
   }

return result;
}

function replace_splitjoin(str, search, replace) {
   return str.split(search).join(replace);
}

Title

Async (check if this is an asynchronous test)

Code

replace_long(str, search, replace);