https://bugzilla.wikimedia.org/show_bug.cgi?id=58640

       Web browser: ---
            Bug ID: 58640
           Summary: =mediawiki-1.22.0 undesired behaviour with pcre-8.34
                    (using php-5.5.7)
           Product: MediaWiki
           Version: 1.22.0
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Unprioritized
         Component: General/Unknown
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: timo.g...@gmail.com
    Classification: Unclassified
   Mobile Platform: ---

Created attachment 14126
  --> https://bugzilla.wikimedia.org/attachment.cgi?id=14126&action=edit
php-5.5.7-with-pcre-8.34.jpg

After upgrading pcre from version 8.33 to 8.34 mediawiki-1.22.0 shows some
undesired/broken behaviour.

* descriptive text when editing a page is missing (see attached screenshots)
* pages with content displayed as blank/empty

Apache error.log shows the following:

[Wed Dec 18 11:40:32.819810 2013] [:error] [pid 20885] [client 127.0.0.1:57571]
PHP Warning:  Invalid argument supplied for foreach() in
/var/www/wiki/htdocs/includes/MagicWord.php on line 882, referer:
http://wiki.domain/index.php/Hauptseite
[Wed Dec 18 11:40:32.819841 2013] [:error] [pid 20885] [client 127.0.0.1:57571]
PHP Warning:  preg_replace(): Compilation failed: group name must start with a
non-digit at offset 4 in /var/www/wiki/htdocs/includes/MagicWord.php on line
886, referer: http://wiki.domain/index.php/Hauptseite
[Wed Dec 18 11:40:32.819871 2013] [:error] [pid 20885] [client 127.0.0.1:57571]
PHP Warning:  preg_match_all(): Compilation failed: group name must start with
a non-digit at offset 4 in /var/www/wiki/htdocs/includes/MagicWord.php on line
881, referer: http://wiki.domain/index.php/Hauptseite

Side note: Downgrading pcre back to 8.33 didn't solve the problem with the
"emtpy" pages immediately, I had to edit and save them (without changing the
content) to get the content displayed again.

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