BugkuCTF 字符？正则？

正则的题

 <?php 
highlight_file('2.php');
$key='KEY{********************************}';
$IM= preg_match("/key.*key.{4,7}key:\/.\/(.*key)[a-z][[:punct:]]/i", trim($_GET["id"]), $match);
if( $IM ){ 
  die('key is: '.$key);
}
?> 

直接构造id
keyykeyyyyykey:/y/keyy.

flag：KEY{0x0SIOPh550afc}