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<?php $string = "This is a " . str_repeat("test", 2) . "!\n" . str_repeat("hello", 3) . " and Bye!\n" . "When I sleep, the thought bubble says " . str_repeat("zz", 3) . "."; echo preg_replace_callback( '~\b(\w+?)\1+\b~', function($m) { return "[{$m[1]}](" . (strlen($m[0]) / strlen($m[1])) . ")"; }, $string );
Output for git.master, git.master_jit, rfc.property-hooks
This is a [test](2)! [hello](3) and Bye! When I sleep, the thought bubble says [z](6).

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