javascript regexp capture match index substring

In this example I want capture the fourth hide in S is hide3;

var S="gwrtgwhide0regwtrghide1erthgrthide2rtgbwtghide3ertghtrwhide4wertgerghide5ertghwrtghide6ewrtghwrtghide7wertgqew";

var j=/^((?:((?!hide\d).)*hide\d)){3}(?:((?!hide\d).)*(hide\d))/.exec(S);

console.log(j[j.length-1]);

Code (JavaScript):

I can to make a function for this in native javascript - ecmascript6

window["getIndexValue"]=(...a)=>{
     let string=a[0],substring=a[1],index=a[2];
     let R=new...

Code (JavaScript):

javascript regexp capture match index substring

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