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<?php $str = 'Hello world [something here]{optional}{optional}{optional}{n possibilities of this}'; var_export(preg_split('/ *\[|\]|(?=\{)/', $str, 0, PREG_SPLIT_NO_EMPTY));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'Hello world', 1 => 'something here', 2 => '{optional}', 3 => '{optional}', 4 => '{optional}', 5 => '{n possibilities of this}', )

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