Question

hi guys i was wondering how could i build e regExp that says:

“this string may contain 1-25 letters that are not these specific words:”root”,”bin”,”download”,”shutdown”

So I thought:

$dang_words="/(root)|(bin)|(shutdown)|(download)/";
$reg_exp="/^[a-z]{1,25}$/";

if(preg_match($reg_exp,$field) || !preg_match($dang_words,$field))
{
 echo "your input it's okkk!";
}
else 
 echo "this is a bad word!!";

But it’s not working

why?

thanks

Luca

Answer 1

$dangerous_words="/(root)|(bin)|(shutdown)|(download)/";
$reg_exp="/^[a-z]{1,25}$/";

if(preg_match($reg_exp,strtolower(trim($field))) && !preg_match($dangerous_words,strtolower(trim($field))))
{
 echo "your input it's okkk!";
}
else 
 echo "this is a bad word!!";

You have your logical operators messed up.. Just changed from || to &&.