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It's called rainbow delimiters and I use it with everything.

http://www.emacswiki.org/RainbowDelimiters

As for the unbalanced delimiters, I just M-x paredit-mode, turn it off, make my fixes (which is easy because rainbow delimiters shows me exactly which delimiter is out of place), and then turn it back on again.

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An easier way to deal with unbalanced delimiters without toggling paredit-mode is to use C-q, quoted-insert. C-q ) inserts a literal ) where regular ) is bound to paredit-close-round.

Quoted insert is generally useful when you want to enter a specific character that is bound to something other than self-insert, such as a literal newline in a regex pattern.

Yep, C-q is also useful when you need to comment out part of a multiline sexp without doing a block select and C-; Otherwise paredit will helpfully move the comment to a newline to avoid breaking the balance ;)

Thankyou!

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