Cercare stringa dentro una stringa (particolare)

[badaze]

Prova questo.

<?php 
$stringa = 'bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla [img]/cartella/ABC-91530-lg.jpg[/img]bla bla bla bla bla bla bla bla bla bla bla bla bla bla[img]/cartella/788888.jpg[/img] bla bla bla bla';
preg_match_all("|/cartella/([^\">]+)|i",$stringa,$out);
print_r($out[1]);
?>