Make regex API explicit in react_room_messages

compiled regexes are not hashable, so we cannot detect the type.

mytrix.py

@@ -131,7 +131,7 @@ class Matrix:
         room = self.get_dm_room(mxid)
         return self.get_room_messages(room, from_, dir_, limit)
 
-    def react_room_messages(self, room, cases):
+    def react_room_messages(self, room, cases, regex=False):
         """Get room messages and trigger callbacks.
 
         The cases argument takes a dictionary mapping strings or compiled regexs to callables.
@@ -153,15 +153,15 @@ class Matrix:
             if event["type"] == "m.room.message" and event["content"]["msgtype"] == "m.text":
                 message = event["content"]["body"]
                 for key_, func in cases.items():
-                    if isinstance(key_, str):
-                        if message.lower().strip() == key_.lower().strip():
-                            matches.append(message)
-                            func(message, event)
-                    elif isinstance(key_, re.Pattern):
+                    if regex:
                         finds = key_.findall(messaage)
                         if finds:
                             matches.append(message)
                             func(finds, event)
+                    else:
+                        if message.lower().strip() == key_.lower().strip():
+                            matches.append(message)
+                            func(message, event)
 
         return matches