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<?php $string = "{random_one}[SUBSTRING1] blah [SUBSTRINGX] blah blah {random_two}[SUBSTRING2] blah blah blah{random_one}[SUBSTRING3]"; preg_match_all("/{.+?}\[(.+?)\]/i", $string, $matches); var_dump($matches[1]);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(10) "SUBSTRING1" [1]=> string(10) "SUBSTRING2" [2]=> string(10) "SUBSTRING3" }

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