How to retrieve an image from a post and display it before excerpt of a post? [duplicate]

Question

This question already has an answer here:

• Get the first image from post content (eg.: hotlinked images) 5 answers

I'm customizing a WordPress template and I would implement the following behavior in the excerpt posts visualization in my homepage:

If a post contains images (one or more), in the homepage post preview show at the begining a thumbnail of the first image that is in the post, then show the excerpt of the post.

At the moment I have the following code that, inside a WordPress loop, show the excerpts of all posts in homepage:

<!-- .entry-summary -->
        <?php else : ?>
        <div class="entry-content">
            <?php the_excerpt(); ?>
            <?php wp_link_pages( array( 'before' => '<div class="page-link"><span>' . __( 'Pages:', 'admired' ) . '</span>', 'after' => '</div>' ) ); ?>
        </div>

As you can see this code snippet show the excerpt of a post.

Is it possible to find the first image in the post, put it into a variable and show it inside a span (or some other HTML tag) before the excerpt visualization?