bug#13802: stack overflow in mm-add-meta-html-tag

[Thien-Thi Nguyen <ttn@gnuvola.org>]

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I see a "Stack overflow in regexp matcher" error traceable back to
lisp/gnus/mm-decode.el func ‘mm-add-meta-html-tag’ fragment:

  (re-search-forward "\
  <meta\\s-+http-equiv=[\"']?content-type[\"']?\\s-+content=[\"']\
  text/\\(\\sw+\\)\\(?:\;\\s-*charset=\\(.+\\)\\)?[\"'][^>]*>" nil t)

To allow the user (not me) to continue, i kludged the form to be:

  (ignore-errors
    (re-search-forward "..." nil t))

that is, wrapping w/ ‘ignore-errors’.  Is there a better solution?

One idea (untested) is to replace the ".+" (used to match the charset)
with a more specific pattern.  Perhaps "[^<>]+" or "\\sw+"?

Thinking more systematically, maybe Emacs should add a condition
‘stack-overflow/regexp’ (or something like that) such that code can
‘condition-case’ for it and try a fallback path.

-- 
Thien-Thi Nguyen ..................................... GPG key: 4C807502
.                  NB: ttn at glug dot org is not me                   .
.                 (and has not been since 2007 or so)                  .
.                        ACCEPT NO SUBSTITUTES                         .
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