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run code in 200+ php & hhvm versions
Bugs & Features
<?php echo preg_replace('/(\{(.+)\})/sU', '<span id="\\2"></span>', 'Qwe {test}, {testie}, {not valid}');
based on Co2BT
Output for 4.3.0 - 7.2.0
Qwe <span id="test"></span>, <span id="testie"></span>, <span id="not valid"></span>