diff --git a/core/lib/Drupal/Core/Render/Element/YearRange.php b/core/lib/Drupal/Core/Render/Element/YearRange.php
index fb89649..a0e4eed 100644
--- a/core/lib/Drupal/Core/Render/Element/YearRange.php
+++ b/core/lib/Drupal/Core/Render/Element/YearRange.php
@@ -55,7 +55,7 @@ public static function processRange(&$element, FormStateInterface $form_state, &
       '#default_value' => $element['#value']['years_back'],
       '#size' => 10,
       '#maxsize' => 10,
-       '#description' => t('Enter a relative value (-9, +9) or an absolute year such as 2015.'),
+      '#description' => t('Enter a relative value (-9, +9) or an absolute year such as 2015.'),
     ];
     $element['years_forward'] = [
       '#type' => 'textfield',
@@ -81,8 +81,8 @@ public static function validateRange(&$element, FormStateInterface $form_state,
     $year_range = $year_range_submitted['years_back'] . ':' . $year_range_submitted['years_forward'];
     $form_state->setValue($element['#parents'], $year_range);
     if (!static::rangeIsValid($year_range)) {
-      $form_state->setError($element['years_back'], t('Starting year must be in the format -9, or an absolute year such as 1980.'));
-      $form_state->setError($element['years_forward'], t('Ending year must be in the format +9, or an absolute year such as 2030.'));
+      $form_state->setError($element['years_back'], t('Starting year must be a relative value (-9, +9) or an absolute year such as 1980.'));
+      $form_state->setError($element['years_forward'], t('Ending year must be a relative value (-9, +9) or an absolute year such as 2030.'));
     }
   }
 
@@ -96,7 +96,7 @@ public static function validateRange(&$element, FormStateInterface $form_state,
    *   TRUE if range is valid.
    */
   public static function rangeIsValid($range) {
-    $matches = preg_match('@^(\-[0-9]+|[0-9]{4}):([\+|\-][0-9]+|[0-9]{4})$@', $range);
+    $matches = preg_match('@^([\+|\-][0-9]+|[0-9]{4}):([\+|\-][0-9]+|[0-9]{4})$@', $range);
     return !($matches < 1);
   }