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diff --git a/common/pattern_utils.js b/common/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
+ * Copyright (C) 2022 Yuchen Pei
+ *
+ * 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) {
+    return str.replace(/[^a-z0-9<>@]+/gi, '');
+  },
+
+  removeWhitespace: function(str) {
+    return str.replace(/\/\//gmi, '').replace(/\*/gmi, '').replace(/\s+/gmi, '');
+  },
+
+  replaceTokens: function(str) {
+    return str.replace(/<.*?>/gi, '.*?');
+  },
+
+  removeJsComments: function(str) {
+    const ml_comments = /\/\*.*?(\*\/)/g;
+    const il_comments = /\/\/.*/gm;
+    return str.replace(ml_comments, '').replace(il_comments, '');
+  }
+};