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$str=<<<log
index.php?system=a&f=9_3_0_0_0
index.php?system=b&f=9_3
index.php?system=c
log;
preg_match_all('/system=(\w+)(?:&f=([\d_]+))?/i',$str,$m);
print_r($m);
Array
(
[0] => Array
(
[0] => system=a&f=9_3_0_0_0
[1] => system=b&f=9_3
[2] => system=c
)
[1] => Array
(
[0] => a
[1] => b
[2] => c
)
[2] => Array
(
[0] => 9_3_0_0_0
[1] => 9_3
[2] =>
)
)
Array
(
[0] => Array
(
[0] => GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=albums&module=list&app=0
[1] => GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=source&module=bibei&app=0&f=9_3_0_0_0
[2] => GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=source&module=bibei&t=2&f=9_3_0_0_0
[3] => GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=albums&module=list&app=0&ccc=666
)
[1] => Array
(
[0] =>
[1] => 9_3_0_0_0
[2] => 9_3_0_0_0
[3] =>
)
)
$str = <<<log
192.168.93.24`2012-03-31 10:02:05`GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=albums&module=list&app=0`http://192.168.93.55:9090/apk/index.php?system=source&module=bibei&app=0&f=9_3_0_0_0`Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.0 Safari/535.7
192.168.93.24`2012-03-31 10:02:05`GET /91063b13bf8ba59b896804d829b0ff20/0/0/apk/index.php?system=source&module=bibei&app=0&f=9_3_0_0_0`http://192.168.93.55:9090/apk/index.php?app=0`Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.0 Safari/535.7
log;
preg_match_all('#GET\s*[^`]+\?(?:(?!&f=)[^`])+(?:&f=([0-9_]+)\s*)?(?=`)#i',$str,$m);
print_r($m);exit;