--- features.admin.inc	2009-11-18 17:51:52.000000000 -0500
+++ features.admin.inc.patched	2010-01-19 18:14:48.000000000 -0500
@@ -143,7 +143,7 @@ function features_export_form_validate_f
       }
       break;
     case 'version':
-      preg_match('/^(?<core>\d+\.x)-(?<major>\d+)\.(?<patch>\d+)-?(?<extra>\w+)?$/', $element['#value'], $matches);
+      preg_match('/^(?P<core>\d+\.x)-(?P<major>\d+)\.(?P<patch>\d+)-?(?P<extra>\w+)?$/', $element['#value'], $matches);
       if (!empty($element['#value']) && !isset($matches['core'], $matches['major'])) {
         form_error($element, t('Please enter a valid version with core and major version number. Example: !example', array('!example' => '6.x-1.0')));
       };