Split variable into several to get infos

I would like to separate this in Javascript and create variables infos1, infos2 ….

So I need a function to separate all the info.

<option value="[infos1][infos2][infos3][infos4]"></option>

var InfosInitial = $('#insert').find("option:selected").val();

var infos1 = ?;

var infos2 = ?;

Thanks you in advance !