diff --git a/src/snek/model/user.py b/src/snek/model/user.py
index f611d6a..2910a6d 100644
--- a/src/snek/model/user.py
+++ b/src/snek/model/user.py
@@ -8,7 +8,7 @@ class UserModel(BaseModel):
         required=True,
         min_length=2,
         max_length=20,
-        regex=r"^[a-zA-Z0-9_]+$",
+        regex=r"^[a-zA-Z0-9_-+/]+$",
     )
     nick = ModelField(
         name="nick",