Looks up the first instance of the node who matches the inputed regex
        expression.
        
        :param      objectRegex | <str>
        
        :return     <XNode> || None

def findNodeByRegex( self, objectRegex ):
        """
        Looks up the first instance of the node who matches the inputed regex
        expression.
        
        :param      objectRegex | <str>
        
        :return     <XNode> || None
        """
        expr = re.compile(nativestring(objectRegex))
        for item in self.items():
            if ( isinstance(item, XNode) and
                 expr.match(item.displayName()) ):
                return item
        return None