Update the comment for ezyang#406

matsuo · Apr 18, 2024 · c8b4404 · c8b4404
1 parent 672a6a1
commit c8b4404
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/library/HTMLPurifier/AttrDef/URI/Host.php b/library/HTMLPurifier/AttrDef/URI/Host.php
@@ -80,8 +80,8 @@ public function validate($string, $config, $context)
         // as per RFC 3696, the top label need only not be all numeric.
         // The productions describing this are:
         $a   = '[a-z]';     // alpha
-        $an  = "[a-z0-9$underscore]";  // alphanum
-        $and = "[a-z0-9-$underscore]"; // alphanum | "-"
+        $an  = "[a-z0-9$underscore]";  // alphanum | "_"
+        $and = "[a-z0-9-$underscore]"; // alphanum | "-" | "_"
         // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
         $domainlabel = "$an(?:$and*$an)?";
         // AMENDED as per RFC 3696