From 7ac3008fe473f8015bda9789be23657d3b329e6d Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Tue, 8 May 2018 10:42:24 -0400
Subject: [PATCH] Refs #29350 -- Fixed 'invalid escape sequence' warning in
 SQLite introspection.

---
 django/db/backends/sqlite3/introspection.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/django/db/backends/sqlite3/introspection.py b/django/db/backends/sqlite3/introspection.py
index 72e3d94955..75fb9a7ced 100644
--- a/django/db/backends/sqlite3/introspection.py
+++ b/django/db/backends/sqlite3/introspection.py
@@ -192,7 +192,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
         fields_sql = create_sql[create_sql.index('(') + 1:create_sql.rindex(')')]
         for field_desc in fields_sql.split(','):
             field_desc = field_desc.strip()
-            m = re.match('(?:(?:["`\[])(.*)(?:["`\]])|(\w+)).*PRIMARY KEY.*', field_desc)
+            m = re.match(r'(?:(?:["`\[])(.*)(?:["`\]])|(\w+)).*PRIMARY KEY.*', field_desc)
             if m:
                 return m.group(1) if m.group(1) else m.group(2)
         return None