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<?php $input = '</p><p><a rel="nofollow" class="external text" href="http://10.20.0.30:1234/index.php/this_is_an_example.html">How_to_sample.</a>'; $pattern = '~(?:\G|\Qhttp://10.20.0.30:1234/index.php\E[^_]+)\K_([^_.]*)~'; echo preg_replace($pattern, " $1", $input);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
</p><p><a rel="nofollow" class="external text" href="http://10.20.0.30:1234/index.php/this is an example.html">How_to_sample.</a>

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116.54 ms | 408 KiB | 5 Q