Jquery extract text with regular expression on complete visible text of web page

I am aware of the jQuery regex plugin of James Padolsey: http://james.padolsey.com/javascript/regex-s开发者_运维百科elector-for-jquery/

But I need something different:

1. The regular expression should search in the whole visible text of the web page.
2. I want to get the text itself, not the element containing them.

The following will match requirement 1, but not 2:

$('*').filter(function() {
    return this.text().match(/\d\d\d/);
});

Any idea how i can do this with a good performance?

---

This should get you an Array of all matches.

var text = $('body').text().match(/\d{3}/g);

jsFiddle.