Global Search is returning an error:

Fatal error: Uncaught exception 'Zend_Search_Lucene_Exception' with message 'Utf8 analyzer needs PCRE unicode support to be enabled.' in /var/www/html/moodle/search/Zend/Search/Lucene/Analysis/Analyzer/Common/Utf8.php:61 Stack trace: #0 /var/www/html/moodle/search/Zend/Search/Lucene/Analysis/Analyzer/Common/Utf8/CaseInsensitive.php(43): Zend_Search_Lucene_Analysis_Analyzer_Common_Utf8->__construct() #1 /var/www/html/moodle/search/query.php(151): Zend_Search_Lucene_Analysis_Analyzer_Common_Utf8_CaseInsensitive->__construct() #2 {main} thrown in /var/www/html/moodle/search/Zend/Search/Lucene/Analysis/Analyzer/Common/Utf8.php on line 61

I checked and PCRE is enabled.