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<html><body>function countLetters($matches) { return $matches[0] . '(' . strlen($matches[0]) . ')';}$input = "Welcome to W3Schools.com!";$pattern = '/[a-z0-9\.]+/i';$result = preg_replace_callback($pattern, 'countLetters', $input);echo $result;</body></html>
Welcome(7) to(2) W3Schools.com(13)!