Filter the first from Quote Post Format

I finally found a solution that works. In case you need it, here it is:

<?php
if (has_post_format('quote', $post->ID)) {
    $content = trim(get_the_content());
    // Take the first quote from the content
    $quote_string = extract_from_string('<blockquote>', '</blockquote>', $content);
    // Make sure there's a quote on the content
    if (!$quote_string == "") {
         // Get the first quote and show it on the Loop
         echo $quote_string;
    } else {
         // If not, show nothing
    }
}
?>