Matching elements for mixins
(Start with . or # and can have > )
function() {
                    var elements, e, c, elem, elemIndex,
                        re = /^[#.](?:[\w-]|\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/;
                    while (true) {
                        elemIndex = parserInput.i;
                        e = parserInput.$re(re);
                        
                        if (!e) {
                            break;
                        }
                        elem = new(tree.Element)(c, e, false, elemIndex, fileInfo);
                        if (elements) {
                            elements.push(elem);
                        } else {
                            elements = [ elem ];
                        }
                        c = parserInput.$char('>');
                    }
                    return elements;
                }