note 47760 added to function.preg-replace

getting an error saying this is an undefined function. What part of php needs to be installed for this to be included. ---- Manual Page -- http://www.php.net/manual/en/function.preg-replace.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47760 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47760&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47760&report=yes Search -- http://master.php.net/manage/user-notes.php