diff --git a/README.md b/README.md
index dfdab3a..79062df 100644
--- a/README.md
+++ b/README.md
@@ -72,7 +72,7 @@ use Pecee\SimpleRouter\SimpleRouter;
 
 SimpleRouter::group(['prefix' => 'v1', 'middleware' => '\MyWebsite\Middleware\SomeMiddlewareClass'], function() {
 
-    SimpleRouter::group(['prefix' => 'services'], function() {
+    SimpleRouter::group(['prefix' => '/services', 'exceptionHandler' => '\MyProject\Handler\CustomExceptionHandler'], function() {
 
         SimpleRouter::get('/answers/{id}', 'ControllerAnswers@show')->where(['id' => '[0-9]+');
         
@@ -131,47 +131,57 @@ The framework has it's own ```Router``` class which inherits from the ```SimpleR
 namespace MyProject;
 
 use Pecee\Handler\ExceptionHandler;
+use Pecee\SimpleRouter\RouterBase;
 use Pecee\SimpleRouter\SimpleRouter;
 
 class Router extends SimpleRouter {
 
-    protected static $exceptionHandlers = array();
+    protected static $defaultExceptionHandler;
 
-    public static function start() {
-
-        Debug::getInstance()->add('Router initialised.');
+    public static function start($defaultNamespace = null) {
 
         // Load routes.php
-        $file = $_ENV['basePath'] . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'routes.php';
+        $file = $_ENV['base_path'] . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'routes.php';
         if(file_exists($file)) {
             require_once $file;
         }
 
-        // Init locale settings
-        Locale::getInstance();
-
-        // Set default namespace for routes
-        $defaultNamespace = '\\'.Registry::getInstance()->get('AppName') . '\\Controller';
-        
-        // Add custom csrf verifier (must extend BaseCsrfVerifier)
-        parent::csrfVerifier('MyProject\Middleware\CustomCsrfVerifier');
+        // Set default namespace
+        $defaultNamespace = '\\'.$_ENV['app_name'] . '\\Controller';
 
         // Handle exceptions
         try {
             parent::start($defaultNamespace);
         } catch(\Exception $e) {
-            /* @var $handler ExceptionHandler */
-            foreach(self::$exceptionHandlers as $handler) {
-                $class = new $handler();
-                $class->handleError($e);
+
+            $route = RouterBase::getInstance()->getLoadedRoute();
+
+            $exceptionHandler = null;
+
+            // Load and use exception-handler defined on group
+            
+            if($route && $route->getGroup()) {
+                $exceptionHandler = $route->getGroup()->getExceptionHandler();
+                
+                if($exceptionHandler !== null) {
+                    $class = new $exceptionHandler();
+                    $class->handleError(RouterBase::getInstance()->getRequest(), $route, $e);
+                }
+            }
+
+            // Otherwise use the fallback default exceptions handler
+           
+            if(self::$defaultExceptionHandler !== null) {
+                $class = new self::$defaultExceptionHandler();
+                $class->handleError(RouterBase::getInstance()->getRequest(), $route, $e);
             }
 
             throw $e;
         }
     }
 
-    public static function addExceptionHandler($handler) {
-        self::$exceptionHandlers[] = $handler;
+    public static function setDefaultExceptionHandler($handler) {
+        self::$defaultExceptionHandler = $handler;
     }
 
 }
diff --git a/src/Pecee/SimpleRouter/RouterBase.php b/src/Pecee/SimpleRouter/RouterBase.php
index 9f83013..6da4e36 100644
--- a/src/Pecee/SimpleRouter/RouterBase.php
+++ b/src/Pecee/SimpleRouter/RouterBase.php
@@ -39,12 +39,16 @@ class RouterBase {
         }
     }
 
-    protected function processRoutes(array $routes, array $settings = array(), array $prefixes = array(), $backstack = false) {
+    protected function processRoutes(array $routes, array $settings = array(), array $prefixes = array(), $backstack = false, $group = null) {
         // Loop through each route-request
 
+        $activeGroup = null;
+
         /* @var $route RouterEntry */
         foreach($routes as $route) {
 
+            $route->setGroup($group);
+
             if($this->defaultNamespace && !$route->getNamespace()) {
                 $namespace = null;
                 if ($route->getNamespace()) {
@@ -75,6 +79,7 @@ class RouterBase {
             $this->currentRoute = $route;
             if($route instanceof RouterGroup && is_callable($route->getCallback())) {
                 $route->renderRoute($this->request);
+                $activeGroup = $route;
             }
             $this->currentRoute = null;
 
@@ -83,7 +88,7 @@ class RouterBase {
                 $this->backstack = array();
 
                 // Route any routes added to the backstack
-                $this->processRoutes($backstack, $mergedSettings, $newPrefixes, true);
+                $this->processRoutes($backstack, $mergedSettings, $newPrefixes, true, $activeGroup);
             }
         }
     }
diff --git a/src/Pecee/SimpleRouter/RouterEntry.php b/src/Pecee/SimpleRouter/RouterEntry.php
index e38ac29..7adc53e 100644
--- a/src/Pecee/SimpleRouter/RouterEntry.php
+++ b/src/Pecee/SimpleRouter/RouterEntry.php
@@ -317,6 +317,15 @@ abstract class RouterEntry {
         return $this->settings['requestMethods'];
     }
 
+    public function getGroup() {
+        return $this->group;
+    }
+
+    public function setGroup($group) {
+        $this->group = $group;
+        return $this;
+    }
+
     abstract function matchRoute(Request $request);
 
 }
\ No newline at end of file
diff --git a/src/Pecee/SimpleRouter/RouterGroup.php b/src/Pecee/SimpleRouter/RouterGroup.php
index 66600fb..61e4d41 100644
--- a/src/Pecee/SimpleRouter/RouterGroup.php
+++ b/src/Pecee/SimpleRouter/RouterGroup.php
@@ -33,4 +33,13 @@ class RouterGroup extends RouterEntry {
         return null;
     }
 
+    public function setExceptionHandler($class) {
+        $this->exceptionHandler = $class;
+        return $this;
+    }
+
+    public function getExceptionHandler() {
+        return $this->exceptionHandler;
+    }
+
 }
\ No newline at end of file
diff --git a/src/Pecee/SimpleRouter/RouterRoute.php b/src/Pecee/SimpleRouter/RouterRoute.php
index 4b7cf98..65e75c9 100644
--- a/src/Pecee/SimpleRouter/RouterRoute.php
+++ b/src/Pecee/SimpleRouter/RouterRoute.php
@@ -6,7 +6,7 @@ use Pecee\Http\Request;
 
 class RouterRoute extends RouterEntry {
 
-    const PARAMETERS_REGEX_MATCH = '{([A-Za-z\-\_]*?\?{0,1})}';
+    const PARAMETERS_REGEX_MATCH = '{([A-Za-z\-\_]*?)\?{0,1}}';
 
     protected $url;
 
@@ -60,12 +60,12 @@ class RouterRoute extends RouterEntry {
 
                 $isParameter = true;
             } elseif($isParameter && $character === '}') {
-                $required = false;
+                $required = true;
                 // Check for optional parameter
                 if($lastCharacter === '?') {
                     $parameter = substr($parameter, 0, strlen($parameter)-1);
                     $regex .= '(?:(?:\/{0,1}(?P<'.$parameter.'>[a-z0-9]*?)){0,1}\\/)';
-                    $required = true;
+                    $required = false;
                 } else {
                     // Use custom parameter regex if it exists
                     $parameterRegex = '[a-z0-9]*?';
@@ -130,12 +130,13 @@ class RouterRoute extends RouterEntry {
     public function setUrl($url) {
 
         $parameters = array();
+        $matches = array();
 
-        preg_match_all('/'.self::PARAMETERS_REGEX_MATCH.'/is', $url, $parameters);
+        if(preg_match_all('/'.self::PARAMETERS_REGEX_MATCH.'/is', $url, $matches)) {
+            $parameters = $matches[1];
+        }
 
-        $parameters = $parameters[1];
-
-        if($parameters !== null) {
+        if(count($parameters)) {
             foreach($parameters as $param) {
                 $this->parameters[$param] = '';
             }