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See Manual:Errors and symptoms#All pages have no content, but when editing a page the wiki text is there

Hi. I am getting this error bug in my wiki

Warning: preg_match(): Compilation failed: group name must start with a non-digit at offset 8 in /home/casavall/public_html/wiki/includes/MagicWord.php on line 739

Warning: preg_match_all(): Compilation failed: group name must start with a non-digit at offset 4 in /home/casavall/public_html/wiki/includes/MagicWord.php on line 717

Warning: Invalid argument supplied for foreach() in /home/casavall/public_html/wiki/includes/MagicWord.php on line 718

Warning: preg_replace(): Compilation failed: group name must start with a non-digit at offset 4 in /home/casavall/public_html/wiki/includes/MagicWord.php on line 722

You can see more details here: https://phabricator.wikimedia.org/T136613

After I posted this one for another user, trying to give an answer:

This is caused by incompatibilities in older versions of MediaWiki with newer versions of the PECL extension. Usually this is solved by simply updating MediaWiki to a current version, e.g. to 1.26.3.