wrap each char in except tags with jQuery

I'm trying to wrap each text character inside a

<div id="test"></div>

with a span tag. No problem there, it's just that I also need to keep nested tags unmodified.

So if the string inside the DIV is:

"Some random text, <b>but</b> wait - there's <a href="http://w3.org">tags</a> inside!"

It should output this for the "but" part

<b><span>b</b><span>u</span><span>t</span></b>

Leaving the < b> and < a> tags alone, but wrapping all other chars in span. I checked text() but that doesn't seem to have a way of preserving tags or "saving back", only extracting the text a开发者_StackOverflow中文版nd permanently removing the < b> and < a>

Maybe some jQuery guru out there knows how to do this?

---

You can do this by using the following code:

$("div").children().andSelf().contents().each(function(){
    if (this.nodeType == 3) {
        var $this = $(this);
        $this.replaceWith($this.text().replace(/(\w)/g, "<span>$&</span>"));
    }
});

See test case on jsFiddle.