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<?php $s = '<h2><strong>Automatic Writing</strong> <strong>– A Conduit For An Entity From Another World?</strong></h2>'; echo preg_replace_callback('~<h([1-6])>.*?</h\1>~is', function($m) { return preg_replace('~</?strong>~i', '', $m[0]); } , $s);
Output for git.master, git.master_jit, rfc.property-hooks
<h2>Automatic Writing – A Conduit For An Entity From Another World?</h2>

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