Only valid php classes should pass validation

extensions/gii/generators/crud/Generator.php

@@ -67,7 +67,7 @@ class Generator extends \yii\gii\Generator
             [['modelClass'], 'validateClass', 'params' => ['extends' => BaseActiveRecord::className()]],
             [['baseControllerClass'], 'validateClass', 'params' => ['extends' => Controller::className()]],
             [['controllerClass'], 'match', 'pattern' => '/Controller$/', 'message' => 'Controller class name must be suffixed with "Controller".'],
-            [['controllerClass'], 'match', 'pattern' => '/(^|\\\\)[A-Z0-9][^\\\\]+Controller$/', 'message' => 'Controller class name must start with an uppercase letter.'],
+            [['controllerClass'], 'match', 'pattern' => '/(^|\\\\)[A-Z][^\\\\]+Controller$/', 'message' => 'Controller class name must start with an uppercase letter.'],
             [['controllerClass', 'searchModelClass'], 'validateNewClass'],
             [['indexWidgetType'], 'in', 'range' => ['grid', 'list']],
             [['modelClass'], 'validateModelClass'],