Replacer is not working does it also check nested ?

let say i have 
```
<div>
<header>
header
</header>
hello
<footer>
footer
</footer>
</div>
```
and i want to replace header and footer with div tag is it possible ? 
```
<div>
<div>
header
</div>
hello
<div>
footer
</div>
</div>
```
