How to set thousand separator in javascript or jquery

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Javascript

jQuery

i have number for which i have to apply a thousand separator

ex if my number

double num = 123454545.125871656

the result should be like

123,454,545.125871656

What I have tried:

num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");

the result getting correct if have pure integer value like 12345789

12,345,789

but when i get double value like 123454545.125871656
i am getting 123,454,545.125,871,656 ---->this worng