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<?php echo preg_replace('/#\w+/i', '<a href="#">$0</a>', '#11 #f1 #1f #ff');
Output for git.master, git.master_jit, rfc.property-hooks
<a href="#">#11</a> <a href="#">#f1</a> <a href="#">#1f</a> <a href="#">#ff</a>

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