php正则过滤内容中指定图片

header("Content-type:text/html;charset=utf-8");
$aaa = "http://upfile.cuepa.cn/data/paper/2020/09/23/20200923163055_898895_small.jpg";
$str = 'sf你好 <img alt=""  title=""  hspace="0" src="http://upfile.cuepa.cn/data/paper/2020/09/23/20200923163055_898895_small.jpg" align="baseline" border="0" title=""/><img alt=""  title=""  hspace="0" src="http://upfile.cuepa.cn/data/paper/2020/09/23/20200923163055_898895_small.jpg" align="baseline" border="0" title=""/>我在这里啊';
echo '这是原始内容：<br/>';
echo $str.'<br/>';
echo '<hr />';
//过滤图片
$str = preg_replace('~<[img|IMG](.*?)src="'.$aaa.'"(.*?)>~s','',$str);
echo '这是过滤后的内容：<br/>';
echo $str;