Very simple string format in JavaScript

string_format.js

/**
* Simple string format.
* @author: Jan Cássio | hey@jancassio.com
* @usage
* "{0} World, my name is {1}".format("Hello", "Jan"); // returns "Hello world, my name is Jan";
*/
String.prototype.format = function()
{
  var i, result, pattern;
  
  result = this;
  
  for (i = 0; i < arguments.length; i++)
  {
    pattern = new RegExp('\\{'+i+'\\}', 'gi');
    result = result.replace(pattern, arguments[i]);
  }
  
  return result;
};