php – Add ' \\ ' before " ' " of a string variable in javascript

I have a javascript variable which hold the value taken from somewhere else(lets say from a API call), taken string is given bellow,

He\'s the reason for this

I assign this string to a variable name \’sample\’. But when I print it, it doesn\’t work since the string has \” \’ \” character. I want to add \” \\ \” before the \” \’ \” character. I tried using this,

var sample = (get the string from a api call).replace(/\'/g,\"\\\\\\\'\");

But it doesn\’t work?

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