Thread:Project:Support desk/ Compilation failed: unknown property name after \P or \p at offset 7 in Scribunto/engines/LuaCommon/UstringLibrary.php

Hi,

I am trying to repeat some of the wikipedia formatting but have a strange issue:

Template:Navbox_with_collapsible_groups http://computing.ccib.rutgers.edu/wiki/index.php/Template:Navbox_with_collapsible_groups

Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_replace_callback: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 604 Warning: preg_match: Compilation failed: unknown property name after \P or \p at offset 7 in /www/mediawiki-core/extensions/Scribunto/engines/LuaCommon/UstringLibrary.php on line 490

http://en.wikipedia.org/wiki/Template:Navbox_with_collapsible_groups

Versions: http://computing.ccib.rutgers.edu/wiki/index.php/Special:Version

Product	Version

MediaWiki	1.21.0rc3 (f4d60c4) PHP	5.3.3 (apache2handler) MySQL	5.1.67-log

CentOS release 6.4 (Final)

What could cause this? Thank you