I totally agree with Nitin. Check membership on entrance, not exit. :-)

+1 for blocking of invalid unicode at input.

/Per


1 jul 2009 kl. 21.49 skrev Nitin Borwankar:

> It seems backward ( I am probably missing something huge) to not  
> validate it on input. If you catch all the bad stuff going in you're  
> less likely (except when you're doing internal transformations) to  
> have bad stuff there in the first place and you can save yourself  
> validations on the way out.
>
> Nitin