Re: PCRE regexp bug ?

I believe I spoke too soon. If I use isset() then even if I leave the field empty it still returns true. I am trying to view the documentation for this function but php.net seems to be timing out now. On Fri, 15 Aug 2003 tpc@csua.berkeley.edu wrote: > > Thank you. I did the following: > > if (isset($_POST[MI]) && (preg_match('/^[[:alpha:]]{1,1}$/', $_POST[MI]) == > 0)) > > and zero is caught. > > On Fri, 15 Aug 2003, CPT John W. Holmes wrote: > > > From: <tpc@csua.berkeley.edu> > > > > > I use preg_match to validate the Middle Initial field of a form and so far > > > it works, except yesterday a user submitted a "0" (zero) as a middle > > > initial! My regexp is: > > > > > > if (!empty($_POST[MI]) && (preg_match('/^[[:alpha:]]{1,1}$/', > > > $_POST[MI]) > > == 0)) > > > > > > I tested it with 0-9 and my regexp catches every digit except 0. > > Curious... > > > > empty("0") is going to be true. So, !empty("0") is going to be false, > > so you > > won't "catch" the zero. > > > > ---John Holmes... > > > > > >