note 74266 deleted from function.preg-replace by colder

Note Submitter: nomex45 at nospam dot yahoo dot com ---- Unlike preg_match, preg_replace will not return FALSE if an invalid regex pattern is fed to it. However, preg_replace will simply not set the variable it's being told to set. We can then detect that preg_replace didn't execute properly and by that deduce that the regex pattern is malformed. This might make it more clear. <?PHP $badregex = '/([a-z]/'; // Errors are suppressed here for security reasons. So how are we supposed to know if the regex pattern is wrong? $return = @preg_replace($badregex, "This is a test.", "*"); // If preg_replace detects that the regex pattern is wrong, it will unset() the variable it's being stored to. if (!isset($return)) { die("Bad regex pattern fed to preg_replace!"); }