Replaces too wide of a string portion, ignoring first close brackets.

The lib does not appear to be respecting the closest closing brackets. 


```
stringInterpolation("{\"serviceAgreementChargeDetails\":{\"regularTotalMonthlyCharges\":\"{{monthlyCharge}}\"}}", {monthlyCharge:10}, { sanity: false });

['{"serviceAgreementChargeDetails":{"regularTotalMonthlyCharges":"', undefined]
```

It is replacing `{{monthlyCharge}}\"}}` instead of `{{monthlyCharge}}`