[Bug: 21.5-b28] Could you please turn on `RE_CHAR_CLASSES' for XEmacs?

[It's me FKtPp ;)]

Steve Youngs wrote:
> * It's me FKtPp ;) <m_pupil at yahoo.com.cn> writes:
>
>   > Stephen J. Turnbull wrote:
>   >> In search.c, line 179 (or so), just change "RE_SYNTAX_EMACS" to
>   >> "RE_SYNTAX_EMACS | RE_CHAR_CLASSES".  Rebuild.  Please let us know how
>   >> it works out.
>
>   > Good news~~ The recompiled XEmacs binary works! And if I make change in
>   > regex.h It works also!
>
>   >> AFAIK this only will work as expected for ASCII files and search
>   >> expressions.  In a Mule build there are likely to be crashes.  For
>   >> those reasons, I would not expect this to appear in the mainline
>   >> without a lot of work.  Definitely we will need testing.
>
> We enabled character classes in SXEmacs 22.1.8 (Mule is enable by
> default in SXEmacs), so far no related crashes.  Steve, if you can give
> me some hairy test cases, I'll be happy to let you know how SXEmacs
> stands up to it.
>   

Got some trouble now. :(

I hear that SXEmacs sharing the same packages repository with XEmacs, so
SXEmacs must have a special character class [:word:] defined.  Or how
can it handle this, while viewing articles in gnus:

  # bind (standard-output stack-trace-on-signal debug-on-signal
stack-trace-on-error debug-on-error)
  # (unwind-protect ...)
 
re-search-forward("\\b\\(\\(www\\.\\|\\(s?https?\\|ftp\\|file\\|gopher\\|nntp\\|news\\|telnet\\|wais\\|mailto\\|info\\):\\)\\(//[-a-z0-9_.]+:[0-9]*\\)?[-a-z0-9_=!?#$@~%&*+\\/:;.,[:word:]]+[-a-z0-9_=#$@~%&*+\\/[:word:]]\\)"
nil t)
  # bind (inhibit-read-only inhibit-point-motion-hooks case-fold-search
alist beg entry regexp)
  # (unwind-protect ...)
  # bind (force)
  gnus-article-add-buttons()
  # (unwind-protect ...)
  # bind (--dolist-temp--98428 elem length alist
article-goto-body-goes-to-point-min-p treated-type highlightp val elem
type total-parts part-number condition)
  gnus-treat-article(nil 1 1)
  # (unwind-protect ...)
  # bind (handles inhibit-read-only handle)
  # (unwind-protect ...)
  # bind (ssw98424)
  # (unwind-protect ...)
  # bind (ihandles)
  gnus-display-mime()
  # bind (gnus-article-buffer buffer-read-only inhibit-read-only)
  gnus-article-prepare-display()
  # (unwind-protect ...)
  # bind (result group gnus-tmp-internal-hook summary-buffer gnus-article)
  # (unwind-protect ...)
  # bind (header all-headers article)
  gnus-article-prepare(89684 nil)
  # bind (all-header article)
  gnus-summary-display-article(89684 nil)
  # (unwind-protect ...)
  # bind (article all-headers gnus-summary-display-article-function
article pseudo force all-headers)
  gnus-summary-select-article(nil nil pseudo)
  # bind (lines)
  gnus-summary-scroll-up(1)
  # bind (command-debug-status)
  call-interactively(gnus-summary-scroll-up)
  (dispatch-event "[internal]")
  # (condition-case ... . error)
  # (catch top-level ...)