Trying on Windows 7 64-bit with 64-bit HUGE Vim 7.4.522 shows it taking a
REALLY long time just to match "1234567890" (one line in the buffer) with
pattern ".\{1,8000}".
Furthermore, I can't seem to interrupt the search with <C-C>, and I get a
"search hit BOTTOM, continuing at TOP" message before it finally matches.
Anchoring the match by changing the pattern to ".\{1,8000}0" or ".\{1,8000}$"
does not seem to help. Even anchoring at both ends, "^.\{1,8000}$", doesn't
help very noticeably.
Setting re=1 makes the search pretty much instantaneous.
Omitting the "8000" makes the search just as fast with re=2. I.e. this pattern
is fast: ".\{1,}"
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