From 184e8b66e5fbe7c01e74eb2636a3986e5e78b3a1 Mon Sep 17 00:00:00 2001
From: Kesav Kolla <(kesav@314ecorp.com)>
Date: Thu, 12 Mar 2020 00:48:33 +0530
Subject: [PATCH] Made user info not required for RedisDSN.  This will fix the
 issue #1275

---
 pydantic/networks.py   | 2 +-
 tests/test_networks.py | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pydantic/networks.py b/pydantic/networks.py
index 7fa637ed70..6347e8e7f6 100644
--- a/pydantic/networks.py
+++ b/pydantic/networks.py
@@ -53,7 +53,7 @@ def url_regex() -> Pattern[str]:
     if _url_regex_cache is None:
         _url_regex_cache = re.compile(
             r'(?:(?P<scheme>[a-z][a-z0-9+\-.]+)://)?'  # scheme https://tools.ietf.org/html/rfc3986#appendix-A
-            r'(?:(?P<user>[^\s:/]+)(?::(?P<password>[^\s/]*))?@)?'  # user info
+            r'(?:(?P<user>[^\s:/]+)?(?::(?P<password>[^\s/]*))?@)?'  # user info
             r'(?:'
             r'(?P<ipv4>(?:\d{1,3}\.){3}\d{1,3})|'  # ipv4
             r'(?P<ipv6>\[[A-F0-9]*:[A-F0-9:]+\])|'  # ipv6
diff --git a/tests/test_networks.py b/tests/test_networks.py
index baf9f5a354..2f3e7eb4a4 100644
--- a/tests/test_networks.py
+++ b/tests/test_networks.py
@@ -452,3 +452,6 @@ class Model(BaseModel):
 
     assert str(Model(v=NameEmail('foo bar', 'foobaR@example.com')).v) == 'foo bar <foobaR@example.com>'
     assert str(Model(v='foo bar  <foobaR@example.com>').v) == 'foo bar <foobaR@example.com>'
+
+if __name__ == '__main__':
+    test_redis_dsns()
\ No newline at end of file