Fixes zendframework#2 - Long Timezones in Zend_Date constructor ignor…

…ed with custom date format

Date.php

@@ -1208,7 +1208,7 @@ public function getTimezoneFromString($zone)
             return $zone;
         }
 
-        preg_match('/([[:alpha:]\/]{3,30})(?!.*([[:alpha:]\/]{3,30}))/', $zone, $match);
+        preg_match('/([[:alpha:]\/_]{3,30})(?!.*([[:alpha:]\/]{3,30}))/', $zone, $match);
         try {
             if (!empty($match) and (!is_int($match[count($match) - 1]))) {
                 $oldzone = $this->getTimezone();