Simple templating engine

gistfile1.txt

var Template = function() {
  
	var pattern = /\{{([\w-]+)\}}/g,
		replacements = {
			"\\" : "\\\\",
			"\\r\\n": "\n",
			"'": "\'",
			"\"":"\\\"" 
		},
		cleanupRX = function() {
			temp = [];
			for(key in replacements) {
				temp.push(key);
			}
			return RegExp("(?:(" + temp.join(")|(") + "))", "g");
		}();
		
	function cleanupHtml(str) {
		return str.replace(cleanupRX, function() {
			for(var i = 1, il = arguments.length - 2;i<il; i++) {
				if( arguments[i] ) {
					return replacements[arguments[i]];
				}
			}
		});
	}

	function Template(str) {
		this.html = cleanupHtml(str);
		this._compile()
	};

	Template.prototype = {
		_compile: function () {
			this.apply = function (words) {
				
				function substitute(match, key) {
					return words[key] || "";
				}
				return this.html.replace(pattern, substitute)
			}
		},
		set: Template
	};
	
	return Template

}();

var template = new Template("{{animal}}s only eat {{food}} and don't like {{fear}}");
template.apply({
    animal: "bee",
    food: "badgers",
    fear: "honey"
});