diff --git a/composer.json b/composer.json
index 64127ce..c90e399 100644
--- a/composer.json
+++ b/composer.json
@@ -5,8 +5,9 @@
 
     "minimum-stability": "stable",
     "require": {
-        "php":               "^7.4 || ^8.0",
-        "jrosset/singleton": "^1.0"
+        "php":                  "^7.4 || ^8.0",
+        "jrosset/singleton":    "^1.0",
+        "jrosset/arrayclasses": "^1.0"
     },
     "autoload":          {
         "psr-4":                 {
diff --git a/src/EnvReader/BaseEnv.php b/src/EnvReader/GenericConfig.php
similarity index 73%
rename from src/EnvReader/BaseEnv.php
rename to src/EnvReader/GenericConfig.php
index b096aed..f4b539c 100644
--- a/src/EnvReader/BaseEnv.php
+++ b/src/EnvReader/GenericConfig.php
@@ -5,6 +5,9 @@ namespace jrosset\EnvReader;
 use DateTime;
 use DateTimeInterface;
 use Exception;
+use jrosset\ArrayClasses\IArrayCast;
+use jrosset\ArrayClasses\ImmutableInsensitiveCaseArrayClass;
+use jrosset\ArrayClasses\InsensitiveCaseArrayClass;
 use jrosset\Singleton\TSingleton;
 use RangeException;
 use UnexpectedValueException;
@@ -12,22 +15,15 @@ use UnexpectedValueException;
 /**
  * Utility class to get informations from ENV file
  *
- * You should overwrite {@see BaseEnv::PATH_ENV} to set ENV file path<br>
- * Overwrite {@see BaseEnv::initProperties()} to set initial properties
+ * Overwrite {@see GenericConfig::initialProperties()} to set initial properties
  */
-abstract class BaseEnv {
+abstract class GenericConfig {
     use TSingleton;
 
     /**
-     * ENV file path
+     * @var InsensitiveCaseArrayClass Current properties
      */
-    protected const PATH_ENV = '.env';
-
-    /**
-     * @var string[] Current properties, read from ENV file (&lt;property name&gt; => &lt;property value&gt;)<br>
-     * <b>NOTE:</b> All properties' name are stored in upper-case
-     */
-    private array $properties;
+    protected InsensitiveCaseArrayClass $properties;
 
     /**
      * Initialize initial properties then read ENV file
@@ -35,66 +31,37 @@ abstract class BaseEnv {
      * @throws Exception If ENV can't be read
      */
     protected function __construct () {
-        $this->properties = array_change_key_case($this->initProperties(), CASE_UPPER);
-        $this->readEnv();
+        $this->properties = new InsensitiveCaseArrayClass($this->initialProperties());
+        $this->readConfig();
     }
+
     /**
-     * Initialize initial properties
+     * Initial properties
+     *
+     * @return string[]|IArrayCast Initial properties
      *
-     * @return string[] Properties initial values (&lt;property name&gt; => &lt;property value&gt;)
+     * @noinspection PhpReturnDocTypeMismatchInspection
      */
-    protected function initProperties (): array {
+    protected function initialProperties () {
         return [
             'APP_DEV' => 0,
         ];
     }
-
     /**
-     * Read the ENV file
+     * Read the configuration file
      *
-     * @throws Exception If ENV can't be read
+     * @return void
+     *
+     * @throws Exception If the configuration file is invalid
      */
-    private function readEnv (): void {
-        if (!file_exists(static::PATH_ENV)) {
-            return;
-        }
-
-        $lines = file(static::PATH_ENV, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
-        if ($lines === false) {
-            throw new Exception('Unable to read environment file "' . static::PATH_ENV . '"');
-        }
-
-        foreach ($lines as $line) {
-            if (preg_match('/^\s*(?:(?<comment>#).*|(?<key>[a-zA-Z0-9_-]+)=(?<value>.+?))$/i', $line, $match) !== 1) {
-                continue;           // Ligne invalide
-            }
-            if (isset($match['comment']) && trim($match['comment']) !== '') {
-                continue;           // Commentaire
-            }
-
-            if (preg_match('/^"(?<payload>.+)(?<!(?<!\\\\)\\\\)"$/', $match['value'], $matchValue) === 1) {
-                $match['value'] = preg_replace(
-                    [
-                        '/(?<!\\\\)\\\\"/',
-                        '/\\\\\\\\/',
-                    ],
-                    [
-                        '"',
-                        '\\',
-                    ],
-                    $matchValue['payload']
-                );
-            }
-            $this->properties[mb_strtoupper($match['key'])] = $match['value'];
-        }
-    }
+    protected abstract function readConfig (): void;
 
     /**
      * Get all properties
      *
-     * @return string[] Get all properties (properties' name are in upper case)
+     * @return ImmutableInsensitiveCaseArrayClass Get all properties (properties' name are in upper case)
      */
-    public function getProperties (): array {
+    public function getProperties (): ImmutableInsensitiveCaseArrayClass {
         return $this->properties;
     }
     /**
@@ -105,7 +72,7 @@ abstract class BaseEnv {
      * @return bool Is the property defined ?
      */
     public function hasProperty (string $name): bool {
-        return array_key_exists(mb_strtoupper($name), $this->getProperties());
+        return $this->properties->has($name);
     }
     /**
      * Get a property value
@@ -119,7 +86,6 @@ abstract class BaseEnv {
      * @throws UnexpectedValueException If property is not set AND $default is Null
      */
     public function getProperty (string $name, ?string $default = null): string {
-        $name = mb_strtoupper($name);
         if (!$this->hasProperty($name)) {
             if ($default === null) {
                 throw new UnexpectedValueException('The "' . $name . '" property is not set');
@@ -127,7 +93,7 @@ abstract class BaseEnv {
             return $default;
         }
 
-        return $this->properties[$name];
+        return $this->properties->get($name);
     }
 
     /**