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<?php preg_match_all('~\{([^}]+)\}~', 'controller/{beta}', $matches); var_dump($matches);
Output for 4.3.0 - 7.2.0
array(2) { [0]=> array(1) { [0]=> string(6) "{beta}" } [1]=> array(1) { [0]=> string(4) "beta" } }