diff --git a/helper/exercises.py b/helper/exercises.py
index 4e3e5ae..99cdff7 100644
--- a/helper/exercises.py
+++ b/helper/exercises.py
@@ -49,7 +49,7 @@ def fix_exercise_ids(exercise, start_id):
 def replace_first_occurrences_with_placeholders(text: str, words_to_replace: list, start_id):
     for i, word in enumerate(words_to_replace, start=start_id):
         # Create a case-insensitive regular expression pattern
-        pattern = re.compile(re.escape(word), re.IGNORECASE)
+        pattern = re.compile(r'\b' + re.escape(word) + r'\b', re.IGNORECASE)
         placeholder = '{{' + str(i) + '}}'
         text = pattern.sub(placeholder, text, 1)
     return text