[Renmiri]

It is possible but...

From class_bbcode.php:

	/**
	* Allows extension of the class functionality at run time by calling an
	* external function. To use this, your tag must have a callback of
	* 'handle_external' and define an additional 'external_callback' entry.
	* Your function will receive 3 parameters:
	*	A reference to this BB code parser
	*	The value for the tag
	*	The option for the tag
	* Ensure that you accept at least the first parameter by reference!
	*
	* @param	string	Value for the tag
	* @param	string	Option for the tag (if it has one)
	*
	* @return	string	HTML representation of the tag
	*/
	function handle_external($value, $option = null)....

So you would have to have a bbcode that called on handle_external($value,$option) and split it

Something like that

<a href="http://stories.mysite.net/viewstory.php?sid=explode_option({option})[0]&chapter=explode_option({option})[1]">{param}</a>

where explode_option($value) was your function..

Optionally, the bbcode parser does parse javascript so you could make do with a javascript function that returned the proper URL

kk, found a mod that taught me how to call "handle external" procedures for bbcodes.
vB Code [table]

Using the xml file it is pretty straight forward. All you need is to import the plugin and create a bbcode for [chapter] with a blank replacement string