diff --git a/pm4py/algo/filtering/common/traces/infix_to_regex.py b/pm4py/algo/filtering/common/traces/infix_to_regex.py
index 954d61992..a8b43ca4d 100644
--- a/pm4py/algo/filtering/common/traces/infix_to_regex.py
+++ b/pm4py/algo/filtering/common/traces/infix_to_regex.py
@@ -1,24 +1,5 @@
-'''
-    PM4Py – A Process Mining Library for Python
-Copyright (C) 2024 Process Intelligence Solutions UG (haftungsbeschränkt)
+from re import escape
 
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU Affero General Public License as
-published by the Free Software Foundation, either version 3 of the
-License, or any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU Affero General Public License for more details.
-
-You should have received a copy of the GNU Affero General Public License
-along with this program.  If not, see this software project's root or
-visit <https://www.gnu.org/licenses/>.
-
-Website: https://processintelligence.solutions
-Contact: info@processintelligence.solutions
-'''
 def translate_infix_to_regex(infix):
     regex = "^"
     for i, act in enumerate(infix):
@@ -29,6 +10,9 @@ def translate_infix_to_regex(infix):
             else:
                 regex = f"{regex}([^,]*,)*"
         else:
+            if act: 
+                act = escape(act)
+            
             if is_last_activity:
                 regex = f"{regex}{act}"
             else: