diff --git a/api.py b/api.py
index 90dfad9..d893d85 100644
--- a/api.py
+++ b/api.py
@@ -31,7 +31,7 @@ def _filter_string(sessions, key, value, match=False):
 
     for session in sessions:
         if match:
-            if re.match(".*" + value + ".*", str(session[key]), re.IGNORECASE):
+            if re.match(".*" + re.escape(value) + ".*", str(session[key]), re.IGNORECASE):
                 filtered_sessions.append(session)
         else:
             if session[key] == value: