Turn on the bright lights – Emacs highlighting
Want to highlight every line in the current Emacs buffer that matches a regexp? Try `highlight-regex`. It serves a purpose similar to `M-x occur` (or better yet, icicle-occur). The highlighting regexs are re-evaluated every time the buffer changes ie the effect is sticky. Use `M-x unhighlight-regex` to disable these.
Want to see what you’ve changed since a buffer’s file was opened? Use `highlight-changes-mode`. It supports “next/prev change” movement and coloring based on change “age”. `highlight-compare-with-file` sounds like a nice alternative to `ediff-buffer-with-file` and `ediff-backup`.
Bonus: light-symbol-mode – Higlight all occurances of whatever symbol the cursor is on
