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<?php $string = "This is my test case for an example."; var_export( preg_split( "/(?=(\S+ \S+))\S+ (?:\S+$)?/", $string, 0, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'This is', 1 => 'is my', 2 => 'my test', 3 => 'test case', 4 => 'case for', 5 => 'for an', 6 => 'an example.', )

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