Both is an object added to the tree when a character class has another nested class in it.
Both
new Both()
public function Both(lhs:Node, rhs:Node)
public function match(matcher:Object, i:Number, seq:String):Boolean
Description copied from Node
This method implements the classic accept node.
match() in org.as2lib.regexp.node.Node
public function study(info:TreeInfo):Boolean
This method is good for all zero length assertions.
study() in org.as2lib.regexp.node.Node