From 2d4a3fee6de2fa45eb82169361918f759269b4ec Mon Sep 17 00:00:00 2001
From: Seth Michael Larson <sethmichaellarson@gmail.com>
Date: Wed, 26 May 2021 10:43:12 -0500
Subject: [PATCH] Improve performance of sub-authority splitting in URL

---
 src/pip/_vendor/urllib3/util/url.py |  8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/pip/_vendor/urllib3/util/url.py b/src/pip/_vendor/urllib3/util/url.py
index 6ff238f..81a03da 100644
--- a/src/pip/_vendor/urllib3/util/url.py
+++ b/src/pip/_vendor/urllib3/util/url.py
@@ -63,12 +63,12 @@ IPV6_ADDRZ_RE = re.compile("^" + IPV6_ADDRZ_PAT + "$")
 BRACELESS_IPV6_ADDRZ_RE = re.compile("^" + IPV6_ADDRZ_PAT[2:-2] + "$")
 ZONE_ID_RE = re.compile("(" + ZONE_ID_PAT + r")\]$")
 
-SUBAUTHORITY_PAT = (u"^(?:(.*)@)?(%s|%s|%s)(?::([0-9]{0,5}))?$") % (
+_HOST_PORT_PAT = ("^(%s|%s|%s)(?::([0-9]{0,5}))?$") % (
     REG_NAME_PAT,
     IPV4_PAT,
     IPV6_ADDRZ_PAT,
 )
-SUBAUTHORITY_RE = re.compile(SUBAUTHORITY_PAT, re.UNICODE | re.DOTALL)
+_HOST_PORT_RE = re.compile(_HOST_PORT_PAT, re.UNICODE | re.DOTALL)
 
 UNRESERVED_CHARS = set(
     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789._-~"
@@ -365,7 +365,9 @@ def parse_url(url):
             scheme = scheme.lower()
 
         if authority:
-            auth, host, port = SUBAUTHORITY_RE.match(authority).groups()
+            auth, _, host_port = authority.rpartition("@")
+            auth = auth or None
+            host, port = _HOST_PORT_RE.match(host_port).groups()
             if auth and normalize_uri:
                 auth = _encode_invalid_chars(auth, USERINFO_CHARS)
             if port == "":
-- 
1.8.3.1

