Question

Find:

ellora[sidebar-1]

and replace only the number, specially finding text in between square brackets (both opening and closing) and replace.
Using replace()

method.result

should be like this

ellora[sidebar-2], ellora[sidebar-3], ...

Answer 1

Something like this:

s = s.replace(/(\w+\[\w+[_-])(\d+)(\])/g, function(str, p1, p2, p3) {
    return p1 + (parseInt(p2) + 1) + p3;
});