I want to accept values in any of the following format:

• -$5
• -$5.00
• $5
• $5.00

Is it possible to do that using Masked Input Plugin?

If not, what plug-in am I looking for?

How do I indicate a character is optional?

The code I've got so far

$.mask.definitions['~']='[ +-]';
$(".currency").mask("~$9");