repeat isearch-forward-regexp with just C-s C-s also

[Dan Jacobson]

ESC C-s runs the command isearch-forward-regexp

OK, but to repeat the last regexp search, another ESC C-s C-s seems
too much to ask.  How about just C-s C-s?  I.e. make C-s C-s will
repeat the last search, be it plain or regexp.  Make this behavior a
new option turned on by default.

<escape> C-s i $ C-s C-s C-e m <escape> C-s C-s C-s C-s
                               ^^^^^^^^pain in the brain,
I don't know why, but it is.  Indeed, (grep "grep -n -e i$
exercises0.in") and next-error is one million times less painful.
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