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<?php $str = 'before <cite>Quote from <a href="/page.php" class="link">Testuser » 29.09.2016 15:08</a>:</cite> after'; $str = preg_replace_callback("/<cite>.*<\/cite>/i", function($matches){ return strip_tags($matches[0], "<cite>"); }, $str); echo $str;
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
before <cite>Quote from Testuser » 29.09.2016 15:08:</cite> after

preferences:
84.21 ms | 1525 KiB | 4 Q