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<?php $re = '/{Delta=(\[[^][,]*,[^][]*])[^{}]*}/'; $str = '{Delta=[r3, r4], X=alarmOff, Y=heatOn}'; preg_match($re, $str, $matches); print_r($matches[1]);
Output for rfc.property-hooks, git.master, git.master_jit
[r3, r4]

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