<?
$data = "<IMG src='http://ifull.co.kr/test/img/1.gif'><br/>안녕하세요...<font size=5>반갑습니다.</font>";

$pattern = "/<img.*?src="[\']?(?P<url>[^(http)].*?)[\"' >]/i";
preg_match($pattern, $data, $match);
$only_img = substr($match['url'],1);

echo $only_img;
echo "<BR>";
print_r($match);

?>