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Editorial Team
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Asked: 2026-05-17T06:12:33+00:00

To quote emacs help, M-/ is: (dabbrev-expand ARG) Expand previous word dynamically. Expands to

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To quote emacs help, M-/ is:

(dabbrev-expand ARG)

Expand previous word “dynamically”.

Expands to the most recent, preceding
word for which this is a prefix. If no
suitable preceding word is found,
words following point are considered.
If still no suitable word is found,
then look in the buffers accepted by
the function pointed out by variable
`dabbrev-friend-buffer-function’.

In other words, if somewhere in program there is a variable called reallyLongVariableName and I type reaM-/ then emacs automatically fills in the rest. If more than one match exists (ex, reallyUglyVariableName) then M-/ cycles thru them.

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1 Answer

  1. Editorial Team

    I believe it exists since eclipse3.1 and was tracked by bug 11668
    (“Add emacs-style “Alt-/” hippie auto completion”).

    Alt+/

    Text editors now support word completion.
    In text editors you can complete a prefix to a word occurring in any of the currently open editors or buffers.
    The default key binding for word completion is Alt+/ (Ctrl+. on the Mac).

    Note: if you repeat the Alt+/ key combination, it will cycle amongst all the word beginning with the current prefix, starting with the closest one from the current edit position.

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