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<?php $str = '"hello world" how are you?'; echo preg_replace_callback('~("[^"]+")|\S+~', function($m) { return isset($m[1]) ? "+" . $m[1] : "+" . $m[0] . "*"; }, $str);
Output for git.master_jit, git.master, rfc.property-hooks
+"hello world" +how* +are* +you?*

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