The systemd.unit(5) manpage sorts unit file specifiers alphabetically since commit systemd/systemd@709f4c472c, and since the order in this regular expression is even less relevant than in the manpage, let’s just do the same to make it easy to compare the letter sets between the two.
systemd mode ============ Major mode for editing systemd units in GNU Emacs. See the commentary in `systemd.el`. Installation ------------ Available as the `systemd` package on MELPA <http://melpa.org/> and marmalade <https://marmalade-repo.org/>. In Emacs, one can locally install as a package with `make dist` and M-x package-install-file RET /path/to/systemd-VERSION.tar RET Otherwise, for either installing into one's `load-path` or a system install, do the usual make make install
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