added regex for topic filter

mqtt_sniffer.py

@@ -1,8 +1,9 @@
 import argparse
 import getpass
-import logging
 import json
+import logging
 import mqtt
+import re
 import time
 
 from textual.app import App, ComposeResult
@@ -10,7 +11,6 @@ from textual.containers import Vertical
 from textual.widgets import Footer, Header, Input, RichLog
 
 
-# TODO: Usage of multiple regex for topic filter
 # TODO: Integrate sending of message (topic + payload)
 
 class MqttReceiver(object):
@@ -68,7 +68,10 @@ class MqttSniffer(App):
         """filter the mqtt messages."""
         topic_match = False
         for topic_filter in self.topic_filter.split(","):
-            topic_match |= topic_filter.lower() in record.topic.lower()
+            try:
+                topic_match |= len(re.findall(topic_filter, record.topic)) > 0
+            except re.error:
+                pass    # No valid regular expression
 
         if topic_match:
             try: