Regex help

[beetle]

I'm making a regex to validate money data, and these are the rules I want: (X will represent numbers)

$ must be at front
.XX -OR- .X is optional for end
. at end NOT valid
1-3 digits left of decimal
infite combinations of XXX, where needed

Examples of valid formats
$xx,xxx.xx
$xxx,xxx,xxx,xxx
$x,xxx,xxx.x
$x.xx

Examples of invalid formats:
$xxxxx
xx,xxx.xx
$xx,xxx.
$xxx,xxx.xxx

Here is what I've got so far, but I know it doesn't work...

moneyReg = "^\\$([0-9]{1,3}[,]{1})*([0-9]{1-3})+(\\.[0-9]{1,2})?$";

I've had several iterations that have had some success, but not total. This is where I am now, and it breaks pretty much on everything...my brain is too tired to backtrack.

Thanks in advance!

[beetle]

Sorry folks...just figured it out

moneyReg = "^\\$(?:(?:[0-9]{1,3},)(?:[0-9]{3},)*[0-9]{3}|[0-9]{1,3})(\\.[0-9]{1,2})?$";

Meep, that's a BIG one!

[MarcusJT]

[Flawless_koder]

\d can replace the [0-9] sections... can't it?

Flawless

[beetle]

Sure can, but since I'm declaring this regex in a string, I like to avoid as many backslashes as possible, as each one has to be escaped by another backslash. Sounds picky, but starts to look confusing...much easier to see the atoms as [0-9] for me.

[Flawless_koder]

Why declare it in a variable?

still two more characters each time - but that's your preference

Flawless

[beetle]

Well, for what I'm using this for, some of the values in the regex come from varialbes. Easier to concatenate them as a string first, and then create a new regex object from the string. Like input that must be a number, variable in length

var lBound = 2;
var uBound = 6;

var numReg ="/^[0-9]{"+lBound+","+uBound+"}$/";
var regex = new RegExp(numReg);

[Flawless_koder]

Makes sense now

Flawless