Different mobile style sheet depending on string in title

So this is what I currently have, if you will check to make sure I wrote this right. I am very green when it comes to this kind of stuff so i’m trying to teach myself.

What I am trying to do is have the page refer to a different style mobile sheet depending on a phrase that is held within the post title in wordpress.

<link type=”text/css” rel=”stylesheet” href=”<?php $string = get_the_title($post->post_parent); $pos = strpos($string, “ABCDEF”); if ($pos === false) {(‘/example1.css’);} else { (‘/example2.css’);} ?>” media=”screen and (max-width: 480px)” />

So on another site I currently use the strpos command to grab a different header based on the content of the post title.
<?php
$string = get_the_title($post->post_parent);
$pos = strpos($string, “AMI1”);
if ($pos === false) {
get_header(‘mlm’);
} else {
get_header(‘ami’);
}
?>

I then looked online and found the code that is used to grab the media=….max with… command. So I am trying to combine them

<link type=”text/css” rel=”stylesheet” href=”https://dropship.com/sites/default/files/css/css_Hxnin-1SwvPu5El9PvnjYBVkWyIbBguo_VBqCEb8zRc.css&#8221; media=”screen and (max-width: 480px)” />

I know that they both work separately, however i’m just taking a stab in the dark when it comes to combining them.
So hopefully combining the two together should grab a separate style sheet for the mobile view based on a phrase that is held in the title.

So if the title contains “abcdef” then it will display the /example1.css on the mobile device.

If it doesn’t contain “abcdef” then it will display the /example2.css on the mobile device.

Can anyone check to make sure I am doing it right and have the right characters in the right place?

Thanks for taking a look at this for me!