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[Nano-devel] disable a time-consuming multiline regex?

From: Benno Schulenberg
Subject: [Nano-devel] disable a time-consuming multiline regex?
Date: Tue, 01 Dec 2015 21:14:06 +0100

Hi all,

The following regex in c.nanorc is very time-hungry:

  # Multiline strings.  This regex is VERY resource intensive!
  color brightyellow start=""(\\.|[^"])*\\[[:space:]]*$" end="^(\\.|[^"])*""

For example, run 'src/nano --cons +4444 src/winio.c',
then press and hold ^Y.  See how the flying by of the
pages is fairly smooth.

Then exit nano and run the same command again, and
type ^Y ^K.  Then press and hold ^Y.  See how after
a few seconds the scrolling begins to stutter and
pause (at least here it does, on a 1.6 GHz Atom).

Maybe that string should be commented out by default?
(When I do so, scrolling becomes fluid.)

Also, the regex doesn't work fully correctly.
For example, run 'src/nano imperfect.c' and type:


The string isn't coloured, which is correct, because backslashes
are missing.  Now type a backslah after "one" -- all three words
are coloured.  But that should happen only when there is also a
backslash after "two".  Nano's regexes are not capable of expressing
this, so maybe also therefore such an imperfect matcher should be


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