- 
    Incident report 
- 
    Resolution: Fixed
- 
    Minor 
- 
    1.9.0 (alpha)
- 
    None
when attempting to add an empty regular expression, error message is shown :
Use of undefined constant S_INCORRECT_EXPRESSION - assumed 'S_INCORRECT_EXPRESSION'[/usr/local/apache2/htdocs/trunk/config.php:437]