display image with preg_replace

hello,
I have this code that displays
hello (image) world
I would like to just display the image.. "hello world" is just an example and it needs to use regex because that text always changes

function display_image($content)
{
	$pattern = '/(<img [^>]*>)/i';
	$replacement = '<a href="http://google.com"">' . '\1</a>';
	$content = preg_replace($pattern, $replacement, $content);
	return $content;
}

$textes = 'hello <img src="https://www.google.com/images/errors/logo_sm.gif"/> world';
echo display_image($textes);

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