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<?php $x = 'tracking{date:Ymd:-1 day}'; $m = array(); preg_match_all('|\{[^\}]+\}|', $x, $m); var_dump($m);
Output for 4.3.0 - 7.1.0
array(1) { [0]=> array(1) { [0]=> string(17) "{date:Ymd:-1 day}" } }