Re: query-replace-interactive not documented

[Richard Stallman]

    How about typing a special key (say, `M-e', where "e" stands for
    "eval" or "expression") in the second prompt for a replacement string
    to switch it to expression reading mode, and after typing RET
    to call `query-replace-regexp-eval' instead of `query-replace-regexp'.
    Actually, this means typing:

    C-M-% from-string RET M-e to-expr RET

This is rather obsure, and ad hoc.  So it is probably harder to
remember than M-x que TAB - TAB - TAB, which works now
and can be found systematically from the command name.