Thanks for offering help. Unfortunately both doesn’t lead to success.
If a remove the “String” word, nothing changes.
Btw: I think the error message is clear “unclosed group”, so it’s expecting another round closing bracket :-/
It I try to escape the error turns into: Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )
Btw: I tried already to create a string variable to save the seperator, like var seperator="(", but then the “unclosed group” error still occurs. Then I tried to use regex (although I have no clue if I am doing it right), still no success.