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<?php echo preg_replace('/([a-z]+[0-9]*)+/i', '<a href="#">$0</a>', '#11 #f1 #1f #ff');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
#11 #<a href="#">f1</a> #1<a href="#">f</a> #<a href="#">ff</a>