Preg replace?

[lupoz]

La sintassi...

ho provato a scrivere:

<?php
$actions = "[A]{Action}";

preg_match_all("^\[.+?\]\{.+?\}^", $actions, $matches);

for ($i=0; $i< count($matches[0]); $i++) {
   echo $matches[0][$i]."
\n";
   echo $matches[1][$i] . "
\n";

}

?>

ma non va, stampa la variabile non modificata e Notice: Undefined offset: 1 in xxxx.php on line 8