all these changes

frontend/node_modules/core-js/modules/es.regexp.flags.js

@@ -0,0 +1,16 @@
+'use strict';
+var DESCRIPTORS = require('../internals/descriptors');
+var defineBuiltInAccessor = require('../internals/define-built-in-accessor');
+var regExpFlagsDetection = require('../internals/regexp-flags-detection');
+var regExpFlagsGetterImplementation = require('../internals/regexp-flags');
+
+// `RegExp.prototype.flags` getter
+// https://tc39.es/ecma262/#sec-get-regexp.prototype.flags
+if (DESCRIPTORS && !regExpFlagsDetection.correct) {
+  defineBuiltInAccessor(RegExp.prototype, 'flags', {
+    configurable: true,
+    get: regExpFlagsGetterImplementation
+  });
+
+  regExpFlagsDetection.correct = true;
+}