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The following code changes the background colour of lines that are composed of the repetition of the comment character for lisp-interaction-mode.

(defface special-comment '((t (:background "orange"))))

(font-lock-add-keywords 'lisp-interaction-mode
   '(("^;;+$" 0 'special-comment t)))

I then transitioned the call to use Syntax Classes (\s< for Comment Starter, \s> for Comment Ender).

(font-lock-add-keywords 'lisp-interaction-mode
   '(("^\\s<\\s<\\s<+$" 0 'special-comment t)))

But, extending this even further, fails

(font-lock-add-keywords nil
   '(("^\\s<\\s<\\s<+$" 0 'special-comment t)))

What can be done to extend this for prog-mode?

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    What have you tried?
    – db48x
    Commented Sep 10, 2022 at 19:44
  • Thank you, that is a better question. I don’t know the answer, but maybe if you read chapter 36 Syntax Tables of the Emacs Lisp Manual you will find it.
    – db48x
    Commented Sep 10, 2022 at 21:53
  • Would the related information be about Comment Starters < and Comment Enders > ?
    – Dilna
    Commented Sep 10, 2022 at 22:07
  • Correct, but note the complications for languages with two–character starters and enders, like C with /* comment */ or C++ with // comment.
    – db48x
    Commented Sep 10, 2022 at 23:31
  • For C and C++ I want to use ^///+$ pattern.
    – Dilna
    Commented Sep 10, 2022 at 23:35

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