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<?php $s = "[[String]]"; if (preg_match_all('~(?=((\[(?:\w++|(?2))*])|\b\w+))~', $s, $m)){ print_r($m[1]); }
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => [[String]] [1] => [String] [2] => String )

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