求一正则

$str = "图片1:<img  src='1.jpg' alt="求一正则" >，图片2：<img  src=\"2.jpg\" alt="求一正则" >";

$str = "图片1:<img  src='1.jpg' alt="求一正则" >，图片2：<img  src=\"2.jpg\" alt="求一正则" >";preg_match_all('/src=([\'"])(.+)\1/isU', $str, $m);print_r($m);

Array(    [0] => Array        (            [0] => src='1.jpg'            [1] => src="2.jpg"        )    [1] => Array        (            [0] => '            [1] => "        )    [2] => Array        (            [0] => 1.jpg            [1] => 2.jpg        ))