From 0ec612d71a71536b5a0072ef5f5f1602a64ad35a Mon Sep 17 00:00:00 2001
From: "Dmitry D. Chernov" <blackdoomer@yandex.ru>
Date: Tue, 31 Mar 2020 19:18:57 +1000
Subject: [PATCH] utils: Style fix and simplify a bit the VALID_USERNAME_RE

---
 telethon/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/telethon/utils.py b/telethon/utils.py
index 0c63d143..74f90011 100644
--- a/telethon/utils.py
+++ b/telethon/utils.py
@@ -64,7 +64,7 @@ TG_JOIN_RE = re.compile(
 #
 # See https://telegram.org/blog/inline-bots#how-does-it-work
 VALID_USERNAME_RE = re.compile(
-    r'^([a-z]((?!__)[\w\d]){3,30}[a-z\d]'
+    r'^([a-z](?:(?!__)\w){3,30}[a-z\d]'
     r'|gif|vid|pic|bing|wiki|imdb|bold|vote|like|coub)$',
     re.IGNORECASE
 )