正则表达式

$cachedir="./data/html/".$model;   //Cache文件的路径；if ($dh = opendir($cachedir)) {     //打开Cache文件夹；    while (($file = readdir($dh)) !== false) {//遍历Cache目录，        $del = '/^index\_'.$material['url'].'\w+\.html/';        $a = preg_match($del,$file);        if(preg_match($del,$file)){            $delfile = $cachedir.'/'.$file;            $delres = unlink($delfile);                //删除遍历到的每一个文件；        }    }    closedir($dh);}

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