diff --git a/src/lib/regexanalyzer/CHANGES.md b/src/lib/regexanalyzer/CHANGES.md
index 9e0232e4b681f..3c4eb8bd7bacf 100644
--- a/src/lib/regexanalyzer/CHANGES.md
+++ b/src/lib/regexanalyzer/CHANGES.md
@@ -5,6 +5,11 @@ Author: Nikos M.
 
 ## Changes to the imported library
 
-date: 2022-11-17
-commit: d51b7e082b73db745a1f8321e65b086902d80d80
-github link: <https://github.com/gorhill/uBlock/commit/d51b7e082b73db745a1f8321e65b086902d80d80>
+#### Date
+
+2023-01-01
+
+Imported version 1.2.0 of the library from
+https://github.com/foo123/RegexAnalyzer/blob/1.2.0/src/js/Regex.js
+
+Minimally modified the code to make it ECMAscript `export`-/`import`-friendly.
diff --git a/src/lib/regexanalyzer/regex.js b/src/lib/regexanalyzer/regex.js
index 1a0dd9c9bc06e..35a27169769de 100644
--- a/src/lib/regexanalyzer/regex.js
+++ b/src/lib/regexanalyzer/regex.js
@@ -7,21 +7,7 @@
 *   https://github.com/foo123/RegexAnalyzer
 *
 **/
-!function(root, name, factory) {
-"use strict";
-if (('undefined'!==typeof Components)&&('object'===typeof Components.classes)&&('object'===typeof Components.classesByID)&&Components.utils&&('function'===typeof Components.utils['import'])) /* XPCOM */
-    (root.$deps = root.$deps||{}) && (root.EXPORTED_SYMBOLS = [name]) && (root[name] = root.$deps[name] = factory.call(root));
-else if (('object'===typeof module)&&module.exports) /* CommonJS */
-    (module.$deps = module.$deps||{}) && (module.exports = module.$deps[name] = factory.call(root));
-else if (('undefined'!==typeof System)&&('function'===typeof System.register)&&('function'===typeof System['import'])) /* ES6 module */
-    System.register(name,[],function($__export){$__export(name, factory.call(root));});
-else if (('function'===typeof define)&&define.amd&&('function'===typeof require)&&('function'===typeof require.specified)&&require.specified(name) /*&& !require.defined(name)*/) /* AMD */
-    define(name,['module'],function(module){factory.moduleUri = module.uri; return factory.call(root);});
-else if (!(name in root)) /* Browser/WebWorker/.. */
-    (root[name] = factory.call(root)||1)&&('function'===typeof(define))&&define.amd&&define(function(){return root[name];} );
-}(  /* current root */          'undefined' !== typeof self ? self : this,
-    /* module name */           "Regex",
-    /* module factory */        function ModuleFactory__Regex(undef) {
+export default (function(root, name, factory) {
 "use strict";
 var __version__ = "1.2.0",
 
@@ -2287,4 +2273,4 @@ var Regex = {
 };
 /* export the module */
 return Regex;
-});
+})();