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<?php echo preg_replace('/\w/i', '<a href="#">$0</a>', '#11 #f1 #1f #ff');
Output for 4.3.0 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.12
#<a href="#">1</a><a href="#">1</a> #<a href="#">f</a><a href="#">1</a> #<a href="#">1</a><a href="#">f</a> #<a href="#">f</a><a href="#">f</a>