JSFiddle - React, Tailwind, and code Playground

HTML

<div class="part"> The part number is [8F8S0JJ9]</div>
<div class="part"> The second part number is [V9S7D73]</div>

JavaScript

$('.part').each(function(){
    var $this       = $(this), 
        partnum_reg = /(\[(.)+\])/g,
        partnum     = String($this.html().match(partnum_reg));
    
    $this.html($this.html().replace(partnum, ''));
    $('<div/>').insertAfter($this).html(partnum);
});