fix: append_or_replace works for '/' chars

tools/append_or_replace

@@ -1,6 +1,5 @@
 #!/bin/bash
 
-
 usage() {
 	echo "Usage: $(basename "$0") <REGEX> <STRING> <FILE>"
 }
@@ -14,11 +13,10 @@ REGEX=$1
 STRING=$2
 FILE=$3
 
-grep -q "$REGEX" $FILE
-if [ $? -eq 1 ]; then
+if ! grep -q "$REGEX" "$FILE"; then
 	echo "$STRING" >>$FILE
 	echo appended
 else
-    sed -i "s/$REGEX/$STRING/g" $FILE
+	sed -i "s|$REGEX|$STRING|g" $FILE
 	echo replaced
 fi