如何从PHP中的字符串中获取单词？

This is my code

$datas= array("AAA","BBB","CCC","AAAAAA","BBBBBB","CCCCCCCCC");

$code = "AAAAAA-BBBBBB-CCCCCCCCC";

    for($i=0;$i<count($datas); $i++){           
             $pos = strpos($code ,$datas[$i]);          
             if($pos!== false){                 
                $this->valid_array[$i] = array("DATA"=> $datas[$i],"SPLITTER"=>substr($code ,strlen($datas[$i]),1));
             }
}

What I need is,

I need to find string inside $code from $datas array. I am using strpos function to find.

The problem is,

The strpos is returning 0 for first index of $datas. $datas[0] contain only 3 A.

But I need only the matched values. How can I check this as strict ?

Expected output is, eg: $code = "AAAAAA-BBBBBB-CCCCCCCCC"; I am looping through the $datas array for checking the $datas elements included in the $code. if it is included I am constructing new "$valid_array" array. so if the code matches elements in the $datas array. the code is correct and I need to return the code. Thanks.