parser too strict on anchor names? [rt.cpan.org #80353]

[ingydotnet]

https://rt.cpan.org/Ticket/Display.html?id=80353

Module ver: YAML-0.84
perl ver:   perl 5, version 14, subversion 2 (v5.14.2) built for cygwin-
thread-multi-64int
OS:         CYGWIN_NT-6.1-WOW64

In _parse_qualifiers, anchor tokens are required to be alphanum:

            $self->die('YAML_PARSE_ERR_BAD_ANCHOR')
              unless $token =~ /^[a-zA-Z0-9]+$/;

The YAML 1.2 spec has a much looser defn of anchor names:

ns-anchor-char  ::= ns-char - c-flow-indicator   
ns-anchor-name  ::= ns-anchor-char+

where ns-char is the (frighteningly huge, and probably not what they 
meant to do) set:
[#x21-#x7E] | #x85 | [#xA0-#xD7FF] | [#xE000-#xFEFE] | [#xFF00-#xFFFD] | 
[#x10000-#x10FFFF]

and c-flow-indicator is: “,” | “[” | “]” | “{” | “}”

My current failure case is an underscore in an anchor name, so /^\w+$/ 
would be sufficient for me, but it seems more investigation is needed 
here.

[perlpunk]

fixed in master by adding -_/. to the allowed characters (although that doesn't allow all characters that are specified)

[perlpunk]

Released YAML 1.24_001