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diff --git a/pattern_utils.js b/pattern_utils.js
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+/**
+ * GNU LibreJS - A browser add-on to block nonfree nontrivial JavaScript.
+ * *
+ * Copyright (C) 2011, 2012, 2013, 2014 Loic J. Duros
+ * Copyright (C) 2014, 2015 Nik Nyby
+ *
+ * This file is part of GNU LibreJS.
+ *
+ * GNU LibreJS is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GNU LibreJS is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU LibreJS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+exports.patternUtils = {
+    /**
+     * removeNonalpha
+     *
+     * Remove all nonalphanumeric values, except for
+     * < and >, since they are what we use for tokens.
+     *
+     */
+    removeNonalpha: function (str) {
+	    var regex = /[^a-z0-9<>@]+/gi;
+	    return str.replace(regex, '');
+    },
+    removeWhitespace: function (str) {
+	    return str.replace(/\s+/gmi, '');
+    },
+    replaceTokens: function (str) {
+	    var regex = /<.*?>/gi;
+	    return str.replace(regex, '.*?');
+    }
+};