Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php (revision 26746)
+++ wp-includes/functions.php (working copy)
@@ -4116,7 +4116,7 @@
 function get_tag_regex( $tag ) {
 	if ( empty( $tag ) )
 		return;
-	return sprintf( '<%1$s[^<]*(?:>[\s\S]*<\/%1$s>|\s*\/>)', tag_escape( $tag ) );
+	return sprintf( '<%1$s[^<]*?(?:>[\s\S]*?<\/%1$s>|\s*\/>)', tag_escape( $tag ) );
 }
 
 /**