I have this keyup:

1. $(".ent").keyup(function(){
2. $(this).val( $(this).val().replace(/[^0-9\.]/g, "") );
3. });

The idea is that only let the user type a decimal number; and it does.

The only problem is that it let type a dot [decimal separator I need] at the beginning; and I don't want that :-(

I've been a while and searched Google for the Reg Exp, but had no luck.

If there's someone who actually understands them, please  illuminate me.

Thanks a lot !!!