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<?php preg_match_all('/([^{}]*?)({([^{}]+|{[^{}]*})*?})/i', '{{}aaaaaaaaaaaaaaa', $result); var_dump($result);
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> array(1) { [0]=> string(2) "{}" } [1]=> array(1) { [0]=> string(0) "" } [2]=> array(1) { [0]=> string(2) "{}" } [3]=> array(1) { [0]=> string(0) "" } }

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