--- 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