Index: tests/Zend/Service/Yahoo/OnlineTest.php
===================================================================
--- tests/Zend/Service/Yahoo/OnlineTest.php	(revision 12417)
+++ tests/Zend/Service/Yahoo/OnlineTest.php	(working copy)
@@ -327,6 +327,24 @@
             $this->assertContains('error occurred sending request', $e->getMessage());
         }
     }
+    
+    /**
+     * Check support for the region option and ensure that it throws an exception
+     * for unsupported regions
+     * 
+     * @group ZF-3222
+     * @return void
+     */
+    public function testWebSearchRegion()
+    {
+    	$this->_yahoo->webSearch('php', array('region' => 'nl'));
+    	try {
+    		$this->_yahoo->webSearch('php', array('region' => 'oops'));
+    		$this->fail('Expected Zend_Service_Exception not thrown');
+    	}catch (Zend_Service_Exception $e) {
+    		$this->assertContains("Invalid value for option 'region': oops", $e->getMessage());
+    	}
+    }
 }
 
 
Index: library/Zend/Service/Yahoo.php
===================================================================
--- library/Zend/Service/Yahoo.php	(revision 12417)
+++ library/Zend/Service/Yahoo.php	(working copy)
@@ -400,6 +400,7 @@
      * 'similar_ok' => bool  permit similar results in the result set
      * 'country'    => string  The country code for the content searched
      * 'license'    => (any|cc_any|cc_commercial|cc_modifiable)  The license of content being searched
+     * 'region'     => The regional search engine on which the service performs the search. default us.
      *
      * @param  string $query    the query being run
      * @param  array  $options  any optional parameters
@@ -803,7 +804,7 @@
     protected function _validateWebSearch(array $options)
     {
         $validOptions = array('appid', 'query', 'results', 'start', 'language', 'type', 'format', 'adult_ok',
-                              'similar_ok', 'country', 'site', 'subscription', 'license');
+                              'similar_ok', 'country', 'site', 'subscription', 'license', 'region');
 
         $this->_compareOptions($options, $validOptions);
 
@@ -838,6 +839,12 @@
                                                                     'txt', 'xls'));
         $this->_validateInArray('license', $options['license'], array('any', 'cc_any', 'cc_commercial',
                                                                       'cc_modifiable'));
+        if (isset($options['region'])){
+            $this->_validateInArray('region', $options['region'], array('ar', 'au', 'at', 'br', 'ca', 'ct', 'dk', 'fi',
+                                                                          'fr', 'de', 'in', 'id', 'it', 'my', 'mx', 
+                                                                          'nl', 'no', 'ph', 'ru', 'sg', 'es', 'se',
+                                                                          'ch', 'th', 'uk', 'us'));
+        }
     }