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?
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