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<?php $string = "This is a short sentence which should include all regex results"; echo preg_replace_callback( '~(\w{3})?(\w+)~', fn($m) => ($m[1] ? "+" : '') . "$m[0]*", $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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