diff --git a/ToolboxStack/output/toolbox-template/run.sh b/ToolboxStack/output/toolbox-template/run.sh
index 5fbb352..c7d5a54 100755
--- a/ToolboxStack/output/toolbox-template/run.sh
+++ b/ToolboxStack/output/toolbox-template/run.sh
@@ -6,10 +6,12 @@ set -euo pipefail
 sanitized_input() {
     local input="$1"
     # Check for potentially dangerous characters/commands
-    if [[ "$input" =~ [;\|&\`\$] ]]; then
-        echo "Error: Invalid input detected: $input" >&2
-        exit 1
-    fi
+    case "$input" in
+        *[\;\|\&\`\$]*)
+            echo "Error: Invalid input detected: $input" >&2
+            exit 1
+            ;;
+    esac
 }
 
 # Validate dependencies