calculate and replace special numbers in pages (javascript)

I am trying to change format of special numbers in my pages.

Numbers format is similar this: 11,111.00 AUD

And these changes should be applied on them:

1. Extract clean number from it: (11111)
2. Calculate cost of them: (11111 * 2)
3. Change currency String with USD
4. Replace Previous Result with Default Value: 22222 USD

Please help me to complete this code:

$(doc开发者_StackOverflowument).ready(function (){
$('body').html( function(i,txt) {return txt.replace(/\d+,\d+.\d+ USD/,'blabla AUD'); });
});

use parseFloat('11,111.00 AUD'.replace(',','')) method of javascript

UPDATE

return (parseFloat(txt.replace(/,/g,'')) * 2)+ " USD"

See demo of the following →

You will have to fix the formatter for this to work for return values above 999,999, but this should work pretty well for you:

var convertAUDtoUSD = function(i,txt) {
    var formatter = function( val ) {
            val = String(val);
            return (val.length > 3) ?
                        val.substring(0, val.length - 3) 
                        + "," 
                        + val.substring(val.length - 3, val.length)
                   : val;
        },
        replacer = function (str, p1, p2) {
            return formatter(parseInt(p1.replace(/\,/g,''),10) * 2) 
                   + p2.replace('AUD','USD');
        };

    return txt.replace(/(\d+,?\d+)(\.\d+\sAUD)/ig, replacer);
};

$('body').html( convertAUDtoUSD );

Demo →

This will strip out the commas and 'AUD', multiply the resulting value by 2 and concatenate the 'USD' text.

return txt.replace(/(,|AUD)/g,'') * 2 + " USD";