On Thu, 2 Jan 2014, Jean-Christophe Deschamps wrote:
> Maybe this is not related to the issue I just encountered, but it
> looks close. I couldn't find a reference to a change in handling \g-n
> in classes in the revision log.
> Previous versions (like 3.8.12 which is the only previous one I'm sure
> worked) allowed negative backreferences inside groups, e.g. \g-1 or
> \g{-1} but 3.8.33 errors on it.
There has never been any support for backreferences in character
classes. Inside a character class, the sequence \g is treated as a
literal "g" character, as it is in Perl. So [\g-1] is the same as [g-1].
Previously, this silently treated the hyphen as a literal. Now it gives
an error, which seems to me to be the right thing to do.
Incidentally, I don't understand your references to versions such as
3.8.33. Recent PCRE versions have been 8.32, 8.33, and 8.34. The new
error was introduced in 8.34.
Philip
--
Philip Hazel
