bug#16046: Bug with Regexp Containing only a Character Class with a Caret (PATCH)

[Stefan Monnier]

> After further experimentation, I suspect that "[^]" is simply not
> a valid regular expression.

Indeed, according to the documentation, for ^ to be treated as itself,
it needs to be "not the first char", but since we have nothing else to
put there, we're kind of screwed.

> This suggests that the broken behavior is within
> `regexp-opt-charset`.  I've attached a patch for that function.

Thank you for tracking down the problem and providing a fix.  I just
installed it in trunk, closing,


        Stefan