diff --git a/Resources/config/validation.yml b/Resources/config/validation.yml
new file mode 100644
index 000000000..419f35a68
--- /dev/null
+++ b/Resources/config/validation.yml
@@ -0,0 +1,7 @@
+Chill\CustomFieldsBundle\Entity\CustomField:
+    properties:
+        slug:
+            - Regex: 
+                pattern: '/^[0-9a-z\-]{1,}$/'
+                message: Characters not allowed. Only lowercase letters, numbers and "-" are allowed.
+            
\ No newline at end of file
diff --git a/Resources/translations/validators.fr.yml b/Resources/translations/validators.fr.yml
new file mode 100644
index 000000000..afb6575ba
--- /dev/null
+++ b/Resources/translations/validators.fr.yml
@@ -0,0 +1 @@
+Characters not allowed. Only lowercase letters, numbers and "-" are allowed.: Caractères non autorisés. Seules les lettres minuscules, les nombres et le tiret ("-") sont autorisés.
\ No newline at end of file