JSFiddle - React, Tailwind, and code Playground

HTML

<a href="moo">moo</a>

JavaScript

// New type of the tag
var replacementTag = 'p';

// Replace all a tags with the type of replacementTag
$('a').each(function() {
    var outer = this.outerHTML;
    
    // Replace opening tag
    var regex = new RegExp('<' + this.tagName, 'i');
    var newTag = outer.replace(regex, '<' + replacementTag);
    
    // Replace closing tag
    regex = new RegExp('</' + this.tagName, 'i');
    newTag = newTag.replace(regex, '</' + replacementTag);
    
    $(this).replaceWith(newTag);
});