From 5b6feaffc96b35c8722698d836f648ed7e4095d3 Mon Sep 17 00:00:00 2001
From: librelois <elois@ifee.fr>
Date: Fri, 16 Aug 2019 23:07:34 +0200
Subject: [PATCH] [fix] precise USER_ID format
---
rfc/0009_Duniter_Blockchain_Protocol_V11.md | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/rfc/0009_Duniter_Blockchain_Protocol_V11.md b/rfc/0009_Duniter_Blockchain_Protocol_V11.md
index 6605ee6..22b7bed 100644
--- a/rfc/0009_Duniter_Blockchain_Protocol_V11.md
+++ b/rfc/0009_Duniter_Blockchain_Protocol_V11.md
@@ -128,7 +128,10 @@ Issuing an identity is the act of creating a link between a *public key* and *an
> « This identity refers to me ! »
#### Identity unique ID
-UCP does not rely on any particular identity format, which remains implementation free. Identity simply has to be a string of length between 2 and 100 characters avoiding usage of line ending characters.
+
+Identity simply has to be a string of length between 2 and 100 characters allowing only alphanumeric characters and `-` and `_`.
+
+The exact regex is `[A-Za-z0-9_-]{2,100}`.
In this document *identifier*, `UserID`, `USER_ID` and `uid` will be indifferently used to refer to this identity string.
--
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