又是正则啊，晕死……

Question

$a = '<p><img src="../upload/201106/201106090229318464.jpg" alt="" /></p>
<p><img src="../upload/201106/201106090229383468.jpg" alt="" /></p>
<p>&nbsp;</p>
<p><img src="../upload/201106/201106090229478097.jpg" alt="" /></p>';preg_match_all("#src=(.*?)\s alt=""#isU",$a,$arr1);
echo $arr1[1][0]; 这样取不到第一张图片的路径+文件名呀

Answer 1

"#src=(.*?)\s alt=""#isU",这个不报错吗？preg_match_all("#src=(.*)\s*alt=\"\"#isU",$a,$arr1);

Answer 2

$a = '<p><img src="../upload/201106/201106090229318464.jpg" alt="" /></p>
<p><img src="../upload/201106/201106090229383468.jpg" alt="" /></p>
<p>&nbsp;</p>
<p><img src="../upload/201106/201106090229478097.jpg" alt="" /></p>';preg_match_all('#src=(.*)\s#isU',$a,$arr1);
print_r($arr1);Array
(
    [0] => Array
        (
            [0] => src="../upload/201106/201106090229318464.jpg" 
            [1] => src="../upload/201106/201106090229383468.jpg" 
            [2] => src="../upload/201106/201106090229478097.jpg" 
        )    [1] => Array
        (
            [0] => "../upload/201106/201106090229318464.jpg"
            [1] => "../upload/201106/201106090229383468.jpg"
            [2] => "../upload/201106/201106090229478097.jpg"
        ))

Answer 3

$str = <<<EOS
<p><img src="../upload/201106/201106090229318464.jpg" alt="" /></p>
<p><img src="../upload/201106/201106090229383468.jpg" alt="" /></p>
<p>&nbsp;</p>
<p><img src="../upload/201106/201106090229478097.jpg" alt="" /></p>;
EOS;preg_match_all('/<img\s+src=[\'"](.*)[\'"]/Ui', $str, $matches);echo '<pre>';print_r($matches[1]);
/*
Array
(
    [0] => ../upload/201106/201106090229318464.jpg
    [1] => ../upload/201106/201106090229383468.jpg
    [2] => ../upload/201106/201106090229478097.jpg
)*/