escape pattern value

app.py

@@ -60,7 +60,7 @@ def highlight_words(input_text, json_output):
         color = color_map[path_key]
         # highlighted_text = highlighted_text.replace(f" {value}", f" <span style='background-color: {color};'>{unquote(f'{value}')}</span>")
 
-        pattern = rf"(?<=[ \n\t]){value}(?=[ \n\t\.\,\?\:\;])"
+        pattern = rf"(?<=[ \n\t]){re.escape(value)}(?=[ \n\t\.\,\?\:\;])"
         replacement = f"<span style='background-color: {color};'>{unquote(value)}</span>"
         highlighted_text = re.sub(pattern, replacement, highlighted_text, flags=re.IGNORECASE)