How to cut out continuous pictures?

For example, there is this piece of code

<code>123
<img src="1.jpg" /><img src="2.jpg" />
321321
<img src="3.jpg" /><img src="4.jpg" />

</code>

How to match and intercept

and

That is to say, I want to intercept the text with consecutive pictures in a string. If there are other characters separating the pictures, they will not be intercepted. .

Any ideas?
Can I use regular expressions?

Reply content:

For example, there is this piece of code

<code>123
<img src="1.jpg" /><img src="2.jpg" />
321321
<img src="3.jpg" /><img src="4.jpg" />

</code>

How to match and intercept

and

That is to say, I want to intercept the text with consecutive pictures in a string. If there are other characters separating the pictures, they will not be intercepted. .

Any ideas?
Can I use regular expressions?

function fn(u) {
    console.log(u);
}

var str = '123\
<img src="1.jpg" /><img src="2.jpg" />\
321321\
<img src="3.jpg" /><img src="4.jpg" />';

str.replace(/<img src="(\d+)\.jpg" \/><img src="(\d+)\.jpg" \/>/g, function(u, number1, number2) {
    if (+number1 + 1 === +number2) {
        fn(u);
    }
});

Output:

< img src="4.jpg" />