求挽救匹配PHP字符串中的cookie

求补救匹配PHP字符串中的cookie
下面这是一段PHP字符串：
HTTP/1.1 200 OK Date: Wed, 12 Mar 2014 11:57:58 GMT Server: Apache/2.2.9 (APMServ) mod_ssl/2.2.9 OpenSSL/0.9.8h PHP/5.2.6 X-Powered-By: PHP/5.2.6 Cache-Control: public,max-age=10 Last-Modified: Wed, 12 Mar 2014 11:57:59 GMT Set-Cookie: session=cef14157b685078cf9c8f5d66fcefa81116a180d%7E53204bc7209fe349757896; expires=Wed, 12-Mar-2014 13:57:59 GMT; path=/; domain=.*****.com Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8

我想用php正则匹配出这段字符串：
Set-Cookie: session=cef14157b685078cf9c8f5d66fcefa81116a180d%7E53204bc7209fe349757896;

求补救！
------解决方案--------------------

$str = "HTTP/1.1 200 OK Date: Wed, 12 Mar 2014 11:57:58 GMT Server: Apache/2.2.9 (APMServ) mod_ssl/2.2.9 OpenSSL/0.9.8h PHP/5.2.6 X-Powered-By: PHP/5.2.6 Cache-Control: public,max-age=10 Last-Modified: Wed, 12 Mar 2014 11:57:59 GMT Set-Cookie: session=cef14157b685078cf9c8f5d66fcefa81116a180d%7E53204bc7209fe349757896; expires=Wed, 12-Mar-2014 13:57:59 GMT; path=/; domain=.*****.com Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8 ";
preg_match("/Set-Cookie:\s*session=[^;]+/i", $str,$match) ;
var_dump($match[0]);

------解决方案--------------------

$s=HTTP/1.1 200 OK Date: Wed, 12 Mar 2014 11:57:58 GMT Server: Apache/2.2.9 (APMServ) mod_ssl/2.2.9 OpenSSL/0.9.8h PHP/5.2.6 X-Powered-By: PHP/5.2.6 Cache-Control: public,max-age=10 Last-Modified: Wed, 12 Mar 2014 11:57:59 GMT Set-Cookie: session=cef14157b685078cf9c8f5d66fcefa81116a180d%7E53204bc7209fe349757896; expires=Wed, 12-Mar-2014 13:57:59 GMT; path=/; domain=.*****.com Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8 
TXT;
preg_match('/(Set-Cookie:\s+session=.+?;)\s+expires=/s',$s,$m);
echo $m[1];

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