I would want to "electrically" insert
\right| when typing
\left| in AucTeX and can't quite figure out how to add characters to AucTex-electric. A list of already defined completions can be found here. Can anyone help me with this issue?
Insert the following lisp snippet into your init-file:
(add-hook 'LaTeX-mode-hook (lambda () (setq LaTeX-electric-left-right-brace t) (local-set-key "|" 'LaTeX-insert-left-brace)))
(setq LaTeX-electric-left-right-brace t) is not really necessary since you have it already customized or hooked in. Nevertheless, it does not hurt if you keep it.