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<?php function markAnchor($str) { return preg_replace('/(#([0-9]+))/','<a href="show.php?id=$2">$1</a>',$str); } echo markAnchor("take a look at #42");
Output for git.master, git.master_jit, rfc.property-hooks
take a look at <a href="show.php?id=42">#42</a>

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