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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="#">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>

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