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@ 2014-12-24T10:05:00Z

<?php

echo preg_replace('/(\{(.+)\})/sU', '<span id="\\2"></span>', 'Qwe {test}, {testie}, {not valid}');

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

41.02 ms | 402 KiB | 5 Q