diff --git a/Lib/http/cookies.py b/Lib/http/cookies.py
index 6694f5478bdadf..86f4dca241e6b5 100644
--- a/Lib/http/cookies.py
+++ b/Lib/http/cookies.py
@@ -131,6 +131,7 @@
 #
 import re
 import string
+import http.cookiejar
 
 __all__ = ["CookieError", "BaseCookie", "SimpleCookie"]
 
@@ -420,37 +421,6 @@ def OutputString(self, attrs=None):
         return _semispacejoin(result)
 
 
-#
-# Pattern for finding cookie
-#
-# This used to be strict parsing based on the RFC2109 and RFC2068
-# specifications.  I have since discovered that MSIE 3.0x doesn't
-# follow the character rules outlined in those specs.  As a
-# result, the parsing rules here are less strict.
-#
-
-_LegalKeyChars  = r"\w\d!#%&'~_`><@,:/\$\*\+\-\.\^\|\)\(\?\}\{\="
-_LegalValueChars = _LegalKeyChars + r'\[\]'
-_CookiePattern = re.compile(r"""
-    \s*                            # Optional whitespace at start of cookie
-    (?P<key>                       # Start of group 'key'
-    [""" + _LegalKeyChars + r"""]+?   # Any word of at least one letter
-    )                              # End of group 'key'
-    (                              # Optional group: there may not be a value.
-    \s*=\s*                          # Equal Sign
-    (?P<val>                         # Start of group 'val'
-    "(?:[^\\"]|\\.)*"                  # Any doublequoted string
-    |                                  # or
-    \w{3},\s[\w\d\s-]{9,11}\s[\d:]{8}\sGMT  # Special case for "expires" attr
-    |                                  # or
-    [""" + _LegalValueChars + r"""]*      # Any word or empty string
-    )                                # End of group 'val'
-    )?                             # End of optional value group
-    \s*                            # Any number of spaces.
-    (\s+|;|$)                      # Ending either at space, semicolon, or EOS.
-    """, re.ASCII | re.VERBOSE)    # re.ASCII may be removed if safe.
-
-
 # At long last, here is the cookie class.  Using this class is almost just like
 # using a dictionary.  See this module's docstring for example usage.
 #
@@ -533,9 +503,7 @@ def load(self, rawdata):
                 self[key] = value
         return
 
-    def __parse_string(self, str, patt=_CookiePattern):
-        i = 0                 # Our starting point
-        n = len(str)          # Length of string
+    def __parse_string(self, rawstr):
         parsed_items = []     # Parsed (type, key, value) triples
         morsel_seen = False   # A key=value pair was previously encountered
 
@@ -545,16 +513,11 @@ def __parse_string(self, str, patt=_CookiePattern):
         # We first parse the whole cookie string and reject it if it's
         # syntactically invalid (this helps avoid some classes of injection
         # attacks).
-        while 0 <= i < n:
-            # Start looking for a cookie
-            match = patt.match(str, i)
-            if not match:
-                # No more cookies
-                break
-
-            key, value = match.group("key"), match.group("val")
-            i = match.end(0)
-
+        for key, value in http.cookiejar.parse_ns_headers([rawstr,])[0]:
+            if key == 'version':
+                continue
+            if not isinstance(value, str):
+                value = str(value)
             if key[0] == "$":
                 if not morsel_seen:
                     # We ignore attributes which pertain to the cookie
diff --git a/Lib/test/test_http_cookies.py b/Lib/test/test_http_cookies.py
index 6072c7e15e92be..c441c96a24c7a8 100644
--- a/Lib/test/test_http_cookies.py
+++ b/Lib/test/test_http_cookies.py
@@ -16,11 +16,6 @@ def test_basic(self):
              'repr': "<SimpleCookie: chips='ahoy' vienna='finger'>",
              'output': 'Set-Cookie: chips=ahoy\nSet-Cookie: vienna=finger'},
 
-            {'data': 'keebler="E=mc2; L=\\"Loves\\"; fudge=\\012;"',
-             'dict': {'keebler' : 'E=mc2; L="Loves"; fudge=\012;'},
-             'repr': '''<SimpleCookie: keebler='E=mc2; L="Loves"; fudge=\\n;'>''',
-             'output': 'Set-Cookie: keebler="E=mc2; L=\\"Loves\\"; fudge=\\012;"'},
-
             # Check illegal cookies that have an '=' char in an unquoted value
             {'data': 'keebler=E=mc2',
              'dict': {'keebler' : 'E=mc2'},
@@ -47,7 +42,20 @@ def test_basic(self):
                     'Set-Cookie: d=r',
                     'Set-Cookie: f=h'
                 ))
-            }
+            },
+            # issue35824 - http.cookies._CookiePattern modifying regular expressions
+            {
+                'data': 'Hello=World; Expires=Thu, 31 Jan 2019 05:56:00 GMT;',
+                'dict': {'Hello': 'World'},
+                'repr': "<SimpleCookie: Hello='World'>",
+                'output': 'Set-Cookie: Hello=World; expires=Thu, 31 Jan 2019 05:56:00 GMT'
+            },
+            {
+                'data': 'Hello=World; Expires=Thu,31 Jan 2019 05:56:00 GMT;',
+                'dict': {'Hello': 'World'},
+                'repr': "<SimpleCookie: Hello='World'>",
+                'output': 'Set-Cookie: Hello=World; expires=Thu,31 Jan 2019 05:56:00 GMT'
+            },
         ]
 
         for case in cases:
diff --git a/Misc/ACKS b/Misc/ACKS
index 81b51f75199159..94ac83610cbfa7 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -622,6 +622,7 @@ Manus Hand
 Milton L. Hankins
 Stephen Hansen
 Barry Hantman
+Zehao Hao
 Lynda Hardman
 Bar Harel
 Derek Harland
diff --git a/Misc/NEWS.d/next/Library/2019-01-27-05-27-23.bpo-35824.gMGwan.rst b/Misc/NEWS.d/next/Library/2019-01-27-05-27-23.bpo-35824.gMGwan.rst
new file mode 100644
index 00000000000000..3ee0e6489c9c96
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-01-27-05-27-23.bpo-35824.gMGwan.rst
@@ -0,0 +1 @@
+Modify the parsing of Expires in Set-Cookie, Spaces and commas are both treated as delimiters. Patch by MeiK.
\ No newline at end of file