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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 git.master, git.master_jit, rfc.property-hooks
</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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