WordPress: Sets default image link to blank, removed all existing image links

fiximagelinks.php

<?php
/*
Plugin Name: FixImageLinks
Description: Defaults image link to none, removes all existing image links which point to a wordpress upload
Version: 1.0
Author: Michael Bianco
Author URI: http://github.com/iloveitaly/
*/

// http://andrewnorcross.com/tutorials/stop-hyperlinking-images/
add_action('admin_init', 'iloveitaly_imagelink_setup', 10);
function iloveitaly_imagelink_setup() {
	$image_set = get_option( 'image_default_link_type' );
	
	if ($image_set !== 'none') {
		update_option('image_default_link_type', 'none');
	}
}

// remove image links: https://gist.github.com/mustabr/5366335
add_filter('the_content', 'iloveitaly_attachment_image_link_remove_filter');
function iloveitaly_attachment_image_link_remove_filter($content) {
	$content = preg_replace(
		array(
			// "/media" for the roots theme
			'{<a(.*?)(wp-att|wp-content/uploads|/media)[^>]*><img}',
			'{ wp-image-[0-9]*" /></a>}'
		),
		array(
			'<img',
			'" />'
		),
		$content
	);

	return $content;
}

?>