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$str='<p><img src=\"/d/file/kj/2015-07-12/10f4f18ceace68eafc692e132000eb0c.jpg\" alt=\"1.jpg\" width=\"479\" height=\"422\" /></p>';
preg_match('/<img\s*src="([^"]+?)"/i',str_replace('\\','',$str),$m);
echo "<pre>";
print_r($m[1]);///d/file/kj/2015-07-12/10f4f18ceace68eafc692e132000eb0c.jpg
echo "</pre>";