diff --git a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
index ebbc502dbd..aabd77c551 100644
--- a/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
+++ b/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php
@@ -1360,7 +1360,7 @@ class FrameworkExtension extends Extension
         }
 
         if ($config['decryption_env_var']) {
-            if (!preg_match('/^(?:\w*+:)*+\w++$/', $config['decryption_env_var'])) {
+            if (!preg_match('/^(?:[-.\w]*+:)*+\w++$/', $config['decryption_env_var'])) {
                 throw new InvalidArgumentException(sprintf('Invalid value "%s" set as "decryption_env_var": only "word" characters are allowed.', $config['decryption_env_var']));
             }
 
diff --git a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
index ec95d4c1b4..defedbbd28 100644
--- a/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
+++ b/src/Symfony/Component/DependencyInjection/ParameterBag/EnvPlaceholderParameterBag.php
@@ -44,7 +44,7 @@ class EnvPlaceholderParameterBag extends ParameterBag
                     return $placeholder; // return first result
                 }
             }
-            if (!preg_match('/^(?:\w*+:)*+\w++$/', $env)) {
+            if (!preg_match('/^(?:[-.\w]*+:)*+\w++$/', $env)) {
                 throw new InvalidArgumentException(sprintf('Invalid %s name: only "word" characters are allowed.', $name));
             }
             if ($this->has($name) && null !== ($defaultValue = parent::get($name)) && !\is_string($defaultValue)) {
@@ -52,7 +52,7 @@ class EnvPlaceholderParameterBag extends ParameterBag
             }
 
             $uniqueName = md5($name.'_'.self::$counter++);
-            $placeholder = sprintf('%s_%s_%s', $this->getEnvPlaceholderUniquePrefix(), str_replace(':', '_', $env), $uniqueName);
+            $placeholder = sprintf('%s_%s_%s', $this->getEnvPlaceholderUniquePrefix(), strtr($env, ':-.', '___'), $uniqueName);
             $this->envPlaceholders[$env][$placeholder] = $placeholder;
 
             return $placeholder;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php b/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php
index 0e61dba035..ea6e3814af 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/ParameterBag/EnvPlaceholderParameterBagTest.php
@@ -187,4 +187,11 @@ class EnvPlaceholderParameterBagTest extends TestCase
         $bag->resolve();
         $this->assertNotNull($bag->get('env(default::BAR)'));
     }
+
+    public function testExtraCharsInProcessor()
+    {
+        $bag = new EnvPlaceholderParameterBag();
+        $bag->resolve();
+        $this->assertStringMatchesFormat('env_%s_key_a_b_c_FOO_%s', $bag->get('env(key:a.b-c:FOO)'));
+    }
 }