remove text from post

Hello!

I would like to remove text from a post.

<?php
ob_start();
the_content(‘Read the full post’,true);
$postOutput = preg_replace(‘/<img[^>]+./’,”, ob_get_contents());
ob_end_clean();
echo $postOutput;
?>

This is a code to remove images from post and I would like to remove text from a post in the same way.

How should I change this code to remove text from a post?

Please teach me how.

Thanks!