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<?php $text = "hello world こんにちは world"; var_dump(preg_split('/([^a-zA-Z ]+)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(12) "hello world " [1]=> string(15) "こんにちは" [2]=> string(6) " world" }

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