写出一个正则表达式满足式子的要求

Question

Currency, in dollars, represented as a positive decimal number rounded to the nearest one-hundredth. Such numbers begin with the character $, have commas separating each group of three digits to the left of the dccimal point, and end with two digits to the right of the dccimal point, for example, $8,937.43 and $7,777,777.77.

Answer 1

^$\d{1,3}(,\d{3})*.\d{2}