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<?php $pattern = "/mango|apple|banana/"; $text = "i like banana and apple alot"; echo preg_replace_callback($pattern, function($matches){ $str = $matches[0]; $len = strlen($str); $stars = str_repeat('*', $len-2); return $str[0].$stars.$str[$len-1]; }, $text);
Output for git.master, git.master_jit, rfc.property-hooks
i like b****a and a***e alot

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