The negated escape sequences \L, \S, \D, \W, ... are misinterpreted inside a character class. That is, [\S] matches \s, but it really should match the opposite.
(Perl does it right.)
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I have a patch for this. It adds a few more character tables so that the negated charset's characters can be added to the -bracketed custom charset, as is the case for the positive charset escapes.
Since I can't attach it here directly, you can find it here: http://ajbj.free.fr/nedit/nedit5.5dev/patches/NegatedEscapesInClassesFix.diff
Interestingly, I notice that (?n\W) does not match newlines (my patch allows (?n[\W]) to do so, which is rather inconsistent). This is true also for \L, \D. Also \y without (?n ) around it will match newline. I believe these to be faults. What about you?
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Jörg's summary from an onlist discussion:
1. (?N ) grouping by default, meaning treat \n as special char by
never matching it unless \n is given explicitly. This implies
that dot, [^...], and all the escape sequences can't match \n.
2. (?n ) grouping, meaning drop NEdit's convention to treat \n
specially and do in effect a Perl-like matching of newlines. That
is, dot does not match \n, [^...] does match \n if it is not
listed, and escape sequences do what they stand for: \s, \y, \D,
\L, and \W match newlines, \S, \Y, \d, \l and \w do not.
3. For the sake of completeness, invent a (?s ) grouping named after
Perl's s(ingle line) modifier. This matches newlines like (?n )
and in addition forces dot to match \n, too.