How to use regex for currency

Question

I need to grab a price from one element and add it to another.

I am using this:

\$\d+(?:\.\d+)?

Which seems to work for $0.50, $1.00, $20.00, $200.00 but I hit a brick wall on $1,000.00 and $10,000.00

(Unlikely $10,000.00 will ever be used).

The comma is tripping me up.

** Edit **

I went away for an hour to come back to heaps of answers. Before I go through them I thought I'd clarify rather than answering all comments:

The platform being used auto generates the total value of items in a shopping cart. It gets rendered in a an element - this changes depending on whether a user is adding or removing items.

The value is unlikely to go into 10,000.00 because the product costs are not that high.

I am new to using the regex it took me long enough to get this far, hence the question.

Auto generated HTML:

<span vertical="False" quote="False" id="catCartSummary">
   <table cellspacing="0" class="cartSummaryTable">
     <tbody>
       <tr>
         <td class="cartSummaryItem">3 item(s), Total: $115.00 <a href="#" class="cartSummaryLink">View Cart</a></td>
       </tr>
     </tbody>
   </table>
</span>

I just need the $ value in this case $115.00 - But I need it to work for $1,000.00

Answer 1

Replace non-digit and non-dot simbols by '', then apply parseFloat:

var currencyValue = parseFloat("$1,000.50".replace(/[^\d\.]/g,''));

console.log( currencyValue ) ;   //1000.5

UPDATE: If your 'HTML Auto generator' generates valid currency strings, then

/\$\S+/g

regexp is enough, for extracting all currencies:

var currencies = $('#cartSummaryItem').text().match(/\$\S+/g);    // ["$115.00"]

Then you could convert them to numbers for performing maths on them:

var currenciesAsNumbers = currencies.map( function(item){
    return parseFloat( item.replace(/[^\d\.]/g,'') );
});    // [115]

Answer 2

This is working for me:

/\$\d+(,\d+)*(?:\.\d+)?/g

DEMO

I found an excellent regex that grabs every valid currency and customed it a bit to your needs:

/^\$[0-9]{1,3}(?:[0-9]*(?:[.,][0-9]{2})?|(?:,[0-9]{3})*(?:\.[0-9]{2})?|(?:\.[0-9]{3})*(?:,[0-9]{2})?)$/g

DEMO

The source of the regex