Fix: anchor-utils filter does not detect an empty anchor tag (e.g. <a name="test"><a>), props Olivier Burgard. If an empty anchor tag is in front of image link, "thickbox" class cannot be added to the link then the image cannot be overlaid by click.

anchor-utils/anchor-utils.php

@@ -51,7 +51,7 @@ class anchor_utils {
 			<\s*a\s+
 			([^<>]+)
 			>
-			(.+?)
+			((?!<\s*\/\s*a\s*>).+?)
 			<\s*\/\s*a\s*>
 			/isx", array('anchor_utils', 'ob_filter_callback'), $text);
 
@@ -118,7 +118,7 @@ class anchor_utils {
 			<\s*a\s+
 			([^<>]+)
 			>
-			(.+?)
+			((?!<\s*\/\s*a\s*>).+?)
 			<\s*\/\s*a\s*>
 			/isx", array('anchor_utils', 'filter_callback'), $text);