Trim excerpt to first paragraph

You can match this with regEx and easily choose the amount of paragraphs to return.

// in context
function triangle_x_excerpt( $text, $raw_excerpt ) {

    $content = apply_filters( 'the_content', get_the_content() );

    $text    = ( preg_match( sprintf( '~(<p>.+?</p>){%d}~i', 1 ), $content, $matches ) ) ? $matches[ 0 ] : $content;

    return preg_replace( "/<img[^>]+\>/i", "", $text );
}

---

$text = prefix_get_p( $content, 1);

---

function prefix_get_p($content, $max = 1)
{
    $max = is_numeric($max) ? absint($max) : 1;

    return (preg_match(sprintf('~(<p>.+?</p>){%d}~i', $max), $content, $matches)) ? $matches[0] : $content;
}

echo "Limit 1" . PHP_EOL;
echo prefix_get_p('<p>aaaaa</p><p>bbbbb</p><p>ccccc</p><p>dddddd</p><p>eeeeeee</p><p>ffffff</p>', 1); // <p>aaaaa</p>

echo "Limit 3" . PHP_EOL;
echo prefix_get_p('<p>aaaaa</p><p>bbbbb</p><p>ccccc</p><p>dddddd</p><p>eeeeeee</p><p>ffffff</p>', 3); // <p>aaaaa</p><p>bbbbb</p><p>ccccc</p>

echo "Limit 2" . PHP_EOL;
echo prefix_get_p('<p>aaaaa</p><p>bbbbb</p><p>ccccc</p><p>dddddd</p><p>eeeeeee</p><p>ffffff</p>', 2); // <p>aaaaa</p><p>bbbbb</p>