b7e9d9bae3
modeline-parse leads by matching an expensive regex against the entire buffer,
which can take a long time on huge files.
Perl takes too long on this regex and it seems not even ripgrep
optimizes the \z component
$ ruby -e '10000.times { puts "a" * 10000 }' > big
$ time rg --multiline --only-matching '\A(.+\n){1,5}|(.+\n){1,5}\z' big | wc -l
10
__________________________
Executed in 419.81 millis
usr time 399.84 millis
sys time 20.78 millis
where
$ time kak big -e q
__________________________
Executed in 179.19 millis
usr time 133.61 millis
sys time 53.50 millis
Let's lose the regex.
Fixes #4911
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