Re-slug - Updated (works in WP 4.7.3)

re-slug.js

(function($) {
  $(function() {
  	$("#re-slug").live("click", function(e) {
  		e.preventDefault();
  		var the_new_slug = $("#title").val();
		$.post(
		ajaxurl,
		{
		action: "sample-permalink",
		post_id: $("#post_ID").val(),
		new_slug: the_new_slug,
		new_title: the_new_slug,
		samplepermalinknonce:$("#samplepermalinknonce").val()
		},
		function(val){
			$("#edit-slug-box").html(val);
			$("#post_name").val(the_new_slug);
			$("#view-post-btn").show();
			$("#re-slug").hide();
		});
   	});
   	$("#title").on("input", function() {
   		$('#re-slug').show();
   	});
  });
 })(jQuery);

re-slug.php

<?php
/*
Plugin Name: Re-slug
Plugin URI: http://exygy.com/re-slug-wordpress-plugin/
Description: Regenerate the post permalink after changing the title
Author: Exygy
Author URI: http://exygy.com 
Version: 1.1
*/

function add_reslug_button ($return) {
	// Add Re-slug button after Edit buton
	$return = str_replace('Edit</button>', 'Edit</button> <button type="button" id="re-slug" class="edit-slug button button-small hide-if-no-js" style="display:inherit;"><a href="#re-slug">Re-slug</a></button>', $return);
	return $return;	
}

add_filter( 'get_sample_permalink_html', 'add_reslug_button', 10, 1 );


function enqueue_reslug_script($hook) {
    if( 'post.php' != $hook && 'post-new.php' != $hook )
        return;
    wp_enqueue_script( 'reslug', plugin_dir_url( __FILE__ ) . '/re-slug.js' );
}
add_action( 'admin_enqueue_scripts', 'enqueue_reslug_script' );