diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 38d940e..a77c1ad 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -1701,7 +1701,7 @@ function install_get_localization_release($version = VERSION) {
 
   // Check if version is a regular stable release (no extra_text: 'rc', 'beta',
   // 'dev', etc.)
-  if (empty($info['extra_text'])) {
+  if (!isset($info['extra_text'])) {
     // Potential translation release to use is the same as the version.
     $releases[] = array(
       'core' => $info['major'] . '.x',
@@ -1781,31 +1781,26 @@ function install_get_localization_release($version = VERSION) {
  *   - extra_number: The number part of "extra" (e.g., "2").
  */
 function _install_get_version_info($version) {
+
   $info = array();
 
   preg_match('/
     (
-      ([0-9]+)    # Major release number.
+      (?P<major>[0-9]+)    # Major release number.
       \.          # .
-      ([0-9]+)    # Minor release number.
+      (?P<minor>[0-9]+)    # Minor release number.
     )             #
     (             #
       -           # - separator for "extra" verion information.
-      (           #
-        ([a-z]+)  # Release extra text (e.g., "alpha").
-        ([0-9]*)  # Release extra number (no separator between text and number).
+      (?P<extra>   #
+        (?P<extra_text>[a-z]+)  # Release extra text (e.g., "alpha").
+        (?P<extra_number>[0-9]*)  # Release extra number (no separator between text and number).
       )           #
       |           # OR no "extra" information.
     )
     /sx', $version, $matches);
 
-  $info['major'] = $matches[2];
-  $info['minor'] = $matches[3];
-  $info['extra'] = isset($matches[5]) ? $matches[5] : '';
-  $info['extra_text'] = isset($matches[6]) ? $matches[6] : '';
-  $info['extra_number'] = isset($matches[7]) ? $matches[7] : '';
-
-  return $info;
+  return $matches;
 }
 
 /**