Come individuare una determinata espressione in una stringa

[satifal]

<?php
$str = "The ring [AGK203941] [1/11]";
preg_match('/\[(\d+)\/(\d+)\]/', $str, $matches);
echo $matches[1]."/".$matches[2];
?>

[koppa]

<?php
$str = "The ring [AGK203941] [1/11]";
preg_match('/\[(\d+)\/(\d+)\]/', $str, $matches);
echo $matches[1]."/".$matches[2];
?>

Grazie mille, un'ultima cosa, come posso dividere "The ring [AGK203941] [1/11]" in "The ring [AGK203941]" e "[1/11]"?

Grazie in anticipo e scusa per il disturbo.

[satifal]

<?php
$str = "The ring [AGK203941] [1/11]";
preg_match('/([A-Za-z0-9\[\] ]+)\[(\d+)\/(\d+)\]/', $str, $matches);
echo $matches[1]." - ".$matches[2]."/".$matches[3];
?>