How to convert a currency string to a double with jQuery or Javascript?

Question

I have a text box that will have a currency string in it that I then need to convert that string to a double to perform some operations on it.

"$1,100.00" → 1100.00

This needs to occur all client side. I have no choice but to leave the currency string as a currency string as input but need to cast/convert it to a double to allow some mathematical operations.

Answer 1

Remove all non dot / digits:

var currency = "-$4,400.50";
var number = Number(currency.replace(/[^0-9.-]+/g,""));