金额正则表达式

public static Boolean test(String msg)
        {
            String par = @"^(-)?(([1-9]{1}\d*)|([0]{1}))(\.(\d){1,2})?$";
            if (Regex.IsMatch(msg, par))
            {
                return true;
            }
            else
            {
                return false;
            }
        }