fix for string.stripTags()

lib/string.js

@@ -791,15 +791,15 @@ string = new (function () {
     @function
     @return {String} A String with HTML tags removed.
     @description Strips HTML tags from a string.
-    @param {String} string The string to strip HTML tags from
+    @param {String} The string to strip HTML tags from
     @param {String|Array} A String or Array containing allowed tags. e.g. "<br><p>"
   */
   this.stripTags = function(string, allowed) {
     // taken from http://phpjs.org/functions/strip_tags/
     var allowed = (((allowed || "") + "").toLowerCase().match(/<[a-z][a-z0-9]*>/g) || []).join(''); // making sure the allowed arg is a string containing only tags in lowercase (<a><b><c>)
     var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>/gi,
     comments = /<!--[\s\S]*?-->/gi;
-    return input.replace(comments, '').replace(tags, function ($0, $1) {
+    return string.replace(comments, '').replace(tags, function ($0, $1) {
       return allowed.indexOf('<' + $1.toLowerCase() + '>') > -1 ? $0 : '';
     });
   }