正则求指点

Question

preg_match_all('/<a.*?href="([^\"]+).*?target="_self"/i',$data,$book);
preg_match_all('/<a.*?target="_self".*?href="([^\"]+)/i',$data,$book);
把上面两个正则合并成一个正则

Answer 1

preg_match_all('/<a.*?href="([^\"]+).*?target="_self"||/<a.*?target="_self".*?href="([^\"]+)/i',$data,$book);

Answer 2

$p = '/<a.*(?:href="([^\"]+?).*|target="_self".*){2}/iU';//这是你要的//测试
$s = '<a target="_self" title="title" href="url" ><a href="URL" target="_self" >';
preg_match_all($p, $s, $r);
print_r($r);
Array
(
    [0] => Array
        (
            [0] => <a target="_self" title="title" href="url
            [1] => <a href="URL" target="_self"
        )    [1] => Array
        (
            [0] => url
            [1] => URL
        ))