How can I enclose content between two divs in a div

Question

I have been through:

1. Wrap plain text in paragraph Jquery
2. Wrap text within element
3. Wrap element between two elements in JavaScript/jQuery?
4. jQuery wrapAll contents including text between two tags
5. Get the text after span element using jquery none of those provide a solution for what I am trying to do. I think adding the div may be part of the reason.

How can I enclose the content between div_1 and div_2 in a div_3

<div id="div_1"></div>
<strong>stuff here that always begins with same string but does not end that way</strong>
some unknown text here
<div id="div_2"></div>

The real issue is that it seems you cannot insert the beginning of a div without the end of div showing up automatically.

For example, if I do something like this:

$(document).ready(function(){
$('#div_1').after('<div id="div_3">');
$('#div_2').before('</div>');
});

div_3 gets inserted after div_1 but with a closing tag i.e.

<div id="div_1"></div>
<div id="div_3"></div>
    <strong>stuff here that always begins with same string but does not end that way</strong>
    some text here with no consistent string
    <div id="div_2"></div>

Answer 1

You can enclose the content between div_1 and div_2 inside a new div element using the following jQuery code:

$('#div_1').nextUntil('#div_2').wrapAll('<div id="dev_3"></div>');