python3Packages.dateparser: fix regex compatibility

Patch by thmo (THomas Moschny) taken from
https://github.com/scrapinghub/dateparser/issues/1045#issuecomment-1129846022.

Also relaxes the regex version constraint.

pkgs/development/python-modules/dateparser/default.nix

@@ -29,7 +29,15 @@ buildPythonPackage rec {
     sha256 = "sha256-bDup3q93Zq+pvwsy/lQy2byOMjG6C/+7813hWQMbZRU=";
   };
 
+  patches = [
+    ./regex-compat.patch
+  ];
+
   postPatch = ''
+    substituteInPlace setup.py --replace \
+      'regex !=2019.02.19,!=2021.8.27,<2022.3.15' \
+      'regex'
+
     # https://github.com/scrapinghub/dateparser/issues/1053
     substituteInPlace tests/test_search.py --replace \
       "('June 2020', datetime.datetime(2020, 6, datetime.datetime.utcnow().day, 0, 0))," \

pkgs/development/python-modules/dateparser/regex-compat.patch

@@ -0,0 +1,11 @@
+--- a/dateparser/languages/locale.py
++++ b/dateparser/languages/locale.py
+@@ -169,7 +169,7 @@ class Locale:
+             if normalize:
+                 value = list(map(normalize_unicode, value))
+             pattern = '|'.join(sorted(value, key=len, reverse=True))
+-            pattern = DIGIT_GROUP_PATTERN.sub(r'?P<n>\d+', pattern)
++            pattern = pattern.replace(r'\d+', r'?P<n>\d+')
+             pattern = re.compile(r'^(?:{})$'.format(pattern), re.UNICODE | re.IGNORECASE)
+             relative_dictionary[pattern] = key
+         return relative_dictionary