fix: append_or_replace tabulation grep -P

tools/append_or_replace

@@ -13,8 +13,8 @@ REGEX=$1
 STRING=$2
 FILE=$3
 
-if ! grep -q "$REGEX" "$FILE"; then
-	PREFIX="" echo "$STRING" >>$FILE
+if ! grep -Pq "$REGEX" "$FILE"; then
+	printf "$STRING\n" >>$FILE
 	echo appended
 else
 	sed -i "s|$REGEX|$STRING|g" $FILE