David Kastrup <[email protected]> writes:
>> Debugger entered--Lisp error: (invalid-regexp "Invalid regular expression")
>>
>> re-search-forward("\\(?:\\\\label{\\(?1:[^}]*\\)}\\|\\[[^]]*\\<label[[:space:]]*=[[:space:]]*{?\\(?1:[^],}]+\\)}?\\)\\|\\(^\\)[
>>
>> ]*\\\\\\(begin{SaveListing}\\|part\\|chapter\\|section\\|subsection\\|subsubsection\\|paragraph\\|subparagraph\\|addchap\\|addsec\\)\\*?\\(\\[[^]]*\\]\\)?[[{
>> \n\\]\\|\\(^\\)[ ]*\\\\\\(include\\|input\\|subfile\\)[{
>> ]+\\([^} \n]+\\)\\|\\(^\\)[
>>
>> ]*\\(\\\\appendix\\)\\|\\(\\\\glossary\\|\\\\index\\|\\\\nomenclature\\)[[{]"
>> nil t)
>
> It would be my guess that
>
> ‘\(?NUM: … \)’
> is the "explicitly numbered group" construct. Normal groups get
> their number implicitly, based on their position, which can be
> inconvenient. This construct allows you to force a particular
> group number. There is no particular restriction on the numbering,
> e.g., you can have several groups with the same number in which
> case the last one to match (i.e., the rightmost match) will win.
> Implicitly numbered groups always get the smallest integer larger
> than the one of any previous group.
>
> is the culprit here. At least in the current XEmacs manual
> <URL:http://www.xemacs.org/Documentation/21.5/html/lispref_45.html#SEC599>
> I can find nothing of the sort.
Yes, that's it. Unfortunately, I use that on purpose in
`reftex-label-regexps' which is a customizable list of regexps which
gets `regexp-opt'ed and starts `reftex-everything-regexp'. By default,
it has one entry matching \label{...} and one matching keyval
label={...} arguments.
RefTeX relies on the first group in `reftex-everything-regexp' capturing
the label name (see reftex-parse.el:242). Without the explicitly
numbered groups, the regex for \label{...} would be group 1, but the
regex for label={...} would already be two.
I don't see an easy fix here on my side. So basically you have two
options:
1. implement explicitly numbered groups in XEmacs (they are really
useful in many cases)
2. remove `reftex-label-regexps' and stick to matching only
\label{...} labels without being able to match other things that
also produce labels
(or even simpler: remove the "?1" from the first regexp in
`reftex-label-regexps' and delete the second regexp. Also make it
to a `defconst' to indicate that nobody should touch it.)
Bye,
Tassilo
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