diff --git a/popup_onload.module b/popup_onload.module
index ae493a3..7cc0fb0 100644
--- a/popup_onload.module
+++ b/popup_onload.module
@@ -234,7 +234,7 @@ function popup_onload_libraries_info() {
     'download url' => 'http://www.jacklmoore.com/colorbox',
     'version arguments' => array(
       'file' => 'jquery.colorbox-min.js',
-      'pattern' => '@Colorbox.+([0-9\.a-z]+)@',
+      'pattern' => '@(?i:Colorbox)\sv?([0-9\.a-z]+)@',
       'lines' => 5,
     ),
     'files' => array(