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@ 2015-09-24T10:50:09Z

<?php

$text = "prova {ciao}";
$text = preg_replace('/\{([^\} ]+)\}/ime', '%[$1]%', $text);

echo "TESTO" .  $text;

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

48.4 ms | 402 KiB | 5 Q