Index: extlink.js
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/extlink/extlink.js,v
retrieving revision 1.4.2.7
diff -u -r1.4.2.7 extlink.js
--- extlink.js	16 May 2009 21:33:38 -0000	1.4.2.7
+++ extlink.js	19 Dec 2009 07:10:23 -0000
@@ -5,13 +5,13 @@
 
   // Determine what subdomains are considered internal.
   if (Drupal.settings.extlink.extSubdomains) {
-    var subdomains = "([^/]*)?";
+    var subdomains = "([^/]*\\.)?";
   }
   else if (subdomain == 'www.' || subdomain == '') {
-    var subdomains = "(www\.)?";
+    var subdomains = "(www\\.)?";
   }
   else {
-    var subdomains = subdomain.replace(".", "\.");
+    var subdomains = subdomain.replace(".", "\\.");
   }
 
   // Build regular expressions that define an internal link.