Question

I’m working on a donation webapp, and I need to format a string the will leave minuses (-), pluses (+), and decimals (.). I want people to be able to format their dollar amounts how they want, but leave the numbers and decimals as is.

I currently have the following code:
var raised = $('#raised').val().replace(/\D/g,'');

Any help? Thanks!

UPDATE

Let me explain a little more about why this is an easy/quick way to validate the input.

This is going to be something that administration is going to use one time only, with only one person in charge. It’s not going to be something where multiple users input to submit actual money. I agree that this could be much better planned, but this is more of a rush job. In fact, showing you what I have done is going to be the quickest way to show you: http://www.cirkut.net/sub/batterydonate-pureCSS/

This is going to be projected during an event/auction so people kind of have an idea of how much money has been donated.

The person in charge of typing in donations is competent enough to type valid inputs, so I was putting together what I could as quickly as possible (the entire thing needs to be done by noon tomorrow).

But anyways I found what I needed. Thanks a lot everyone!

Answer 1

To do exactly what you’re asking, you could use this regex:

var raised = $('#raised').val().replace(/[^-+.\d]/g,'');

But be advised, you’ll still need to verify that the returned string is a valid number, because strings like '---' and '+++' will pass. This, perhaps, is not even something you want to do on the client-side.