Add support for regexes for user agents

ai_blocker/ualist_backers.py

@@ -1,3 +1,5 @@
+import re
+
 from abc import ABC, abstractmethod
 
 from django.conf import settings
@@ -9,6 +11,11 @@ class UAList(ABC):
     def get_ua_list(self) -> list[str]:
         raise NotImplemented
 
+    def __contains__(self, item):
+        list = self.get_ua_list()
+        pattern = "|".join(list)
+        return re.search(pattern, item) is not None
+
 
 
 class ConfigBackedUAList(UAList):