recursiveSearch.js

function locate(target, value, path = null){
	if(target instanceof RegExp){
		if(target.test(value)) return path
	}
	else{
		if(value === target) return path
	}

	if(Array.isArray(value)){
		return value.reduce((memo, v, i) =>
			memo || locate(target, v, path ? `${path}[${i}]` : `[${i}]`), null)
	}

	if(value === Object(value)){
		return Object.keys(value).reduce((memo, k) =>
			memo || locate(target, value[k], path ? `${/]$/.test(path) ? path : path + '.'}${k}` : k), null)
	}

	return null
}