Re: Matches for multiline regexps

[Richard Stallman]

    Start with a buffer containing three lines with "11" in them and a
    final newline:

    11
    11
    11

    Result of `M-x keep-lines RET 11 C-q C-j 11 RET' with point at bob:

    11
    11

The basic ideas of keep-lines and flush-lines don't obviously extend
to multi-line regexps.  Figuring out what they ought to mean in such a
case would be rather difficult--and why take the trouble?