Javascript or jQuery replace text

I need to replace some text that is on the page within the body tag. I am using javascript but have jquery available if needed. I basically need to replace test® (test with the registered trademark) with TEST® or tests® with TESTS® and it could even be test with TEST® or tests with TESTS®. I am able to uppercase them but its not liking to work for me with the ® sign, it wants to put duplicates on ones that already have it. Basically anything on the page that has the word test or tests should be TEST®开发者_StackOverflow中文版; or TESTS® if it is plural. Any help is appreciated.

EDIT:

So now I have this:

var html = $('body').html();
var html = html.replace(/realtor(s)?(®)?/gi, function(m, s1, s2){
    var s = s1?s1.toUpperCase():"";
    var reg = s2?s2:'®';
    return "REALTOR"+s+reg;
});
$('body').html(html);

Its working well other than it is duplicating the ® on the ones that already had them any ideas on how not to?

As others have already said, you will not be able to match the ®, you need to match on
\u00ae.

The code you provided needs to be changed to:

var html = $('body').html();
var html = html.replace(/realtor(s)?(\u00ae)?/gi, function(m, s1, s2){
    var s = s1?s1.toUpperCase():"";
    var reg = s2?s2:'®';
    return "REALTOR"+s+reg;
});
$('body').html(html);

To expand on jAndy's answer, try this:

 $("div, p, span").each(function(){
  o = $(this);
  o.html( o.text().replace(/test(|s)\u00ae/gi, function($1){
     return($1.toUpperCase());
  }));
 });

Using the code you provided, try this:

$(document).ready(function(){
 $('body').html( $('body').html().replace(/realtor(|s)\u00ae/gi, function($1){
  return($1.toUpperCase() );
 }));
})

Instead of creating something from scratch try using an alternate library. I develop with PHP so using a library that has identical methods in JavaScript is a life saver.

PHP.JS Library

var newReplaced = $P.str_replace("find","replace",varSearch);

The tricky part here is to match the ®, which is a Unicode character, I guess... Have you tried the obvious?

var newStr = str.replace(/test(s)?®?/gi, function(m, s1){
  var s = s1?s1.toUpperCase():"";
  return "TEST"+s+"®";
});

If the problem is that ® does not match, try with its unicode character number:

/test(s)?\u00ae/

Sorry if the rest does not work, I assume your replacement already works and you just have to also match the ® so that it does not get duplicated.