You need to clarify your example, because it appears that you are inserting `+` and `3` between existing parens rather than shifting them. But regardless, I th

You need to clarify your example, because it appears that you are inserting `+` and `3` between existing parens rather than shifting them. But regardless, I think the answer you are looking for is: Some of the coolest kids of all use rainbow delimiters so that they can easily identify the matching closing paren with their eyes!