On 21 May 2010 14:21, Ashley Sheridan <a...@ashleysheridan.co.uk> wrote:

> I still think you might be better off using BBCode, which is used on
> websites just for this very purpose. When any input comes back, you can
> remove all the HTML completely and replace the BBCode tags that you
> allow. This should guarantee that the only HTML in the text is what you
> put there. That way, the only chance someone has to enter malicious code
> is to manipulate your replacement algorithm.

We don't know what the use case is. It's likely that HTML is a fixed
requirement here.

In any case, stripping the HTML from a post and leaving just the
BBCode is almost as difficult as stripping out all tags except <p>.
There are so many text encodings and weird quirks out there that I
wouldn't trust any code I'd written myself to do it. HTMLPurifier is
widely adopted and tested, and actively maintained.

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