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<?php $string = "This is a short sentence which should include all regex results"; echo preg_replace(array('/\b(\w{1,3})\b/', '/\b(\w{4,})\b/'), array('$1*', '+$1*'), $string);
Output for git.master, git.master_jit, rfc.property-hooks
+This* is* a* +short* +sentence* +which* +should* +include* all* +regex* +results*

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