Actionscript equivalent of PHP's explode()

I remember that in PHP, there was a nice little function that breaks apart a string. For example:

$string = “1||2||3”;
var_dump(explode(’||’, $string));

How would I do this in Actionscript? Here’s what I have so far:

xVals = new Array();
newstuff = new Array();

xVals[1] = 20;
xVals[1] = xVals[1] + "," + 40;

so,

xVals[1] = 20,40;

newstuff = explode(’,’, xVals[1]));

Any help would be greatly appeciated, thanks
~Matt