Manuel Ortega wrote:
> On Sun, Apr 24, 2016 at 2:37 AM, Manuel Ortega <[email protected]>
> wrote:
>
> > Well this is fairly recent, but I don't know which patch did it. The old
> > regex engine's behavior broke.
> >
> > To reproduce:
> >
> > vim -u NONE -N -c "set re=1"
> >
> > Put this text in a buffer: Motörhead
> >
> > (That second "o", with the umlaut, is "<ö> 246, Hex 00f6, Octal 366"
> > according to 'ga'.)
> >
> > :syn match foo '[[:print:]]\+'
> > :hi foo guifg=green
> >
> > Now notice that all the letters in "Motörhead" except the fancy one are
> > green. This seems like a bug; they should all be green. Surely "ö" is
> > "printable". Also notice that if you replace [[:print:]] with [[:alnum:]]
> > it's the same problem.
> >
> > I could swear up and down that Vim did not formerly do this with &re=1;
> > Vim doesn't do it *now* if &re=0. I'm on OS X 10.11.4, with Vim from HEAD.
>
> Bisection reveals that the problem was introduced by 7.4.704, from a year
> ago.
I can reproduce the problem. Previously illegal single-byte characters
were used for these classes. Patch 7.4.704 correctly reject the illegal
bytes, but does not fix the source.
I think we can change the regc() into regmbc() to make this work.
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