--- /dev/null
+var DESCRIPTORS = require('../internals/descriptors');
+var global = require('../internals/global');
+var isForced = require('../internals/is-forced');
+var inheritIfRequired = require('../internals/inherit-if-required');
+var defineProperty = require('../internals/object-define-property').f;
+var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
+var isRegExp = require('../internals/is-regexp');
+var getFlags = require('../internals/regexp-flags');
+var stickyHelpers = require('../internals/regexp-sticky-helpers');
+var redefine = require('../internals/redefine');
+var fails = require('../internals/fails');
+var setInternalState = require('../internals/internal-state').set;
+var setSpecies = require('../internals/set-species');
+var wellKnownSymbol = require('../internals/well-known-symbol');
+
+var MATCH = wellKnownSymbol('match');
+var NativeRegExp = global.RegExp;
+var RegExpPrototype = NativeRegExp.prototype;
+var re1 = /a/g;
+var re2 = /a/g;
+
+// "new" should create a new object, old webkit bug
+var CORRECT_NEW = new NativeRegExp(re1) !== re1;
+
+var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
+
+var FORCED = DESCRIPTORS && isForced('RegExp', (!CORRECT_NEW || UNSUPPORTED_Y || fails(function () {
+ re2[MATCH] = false;
+ // RegExp constructor can alter flags and IsRegExp works correct with @@match
+ return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
+})));
+
+// `RegExp` constructor
+// https://tc39.github.io/ecma262/#sec-regexp-constructor
+if (FORCED) {
+ var RegExpWrapper = function RegExp(pattern, flags) {
+ var thisIsRegExp = this instanceof RegExpWrapper;
+ var patternIsRegExp = isRegExp(pattern);
+ var flagsAreUndefined = flags === undefined;
+ var sticky;
+
+ if (!thisIsRegExp && patternIsRegExp && pattern.constructor === RegExpWrapper && flagsAreUndefined) {
+ return pattern;
+ }
+
+ if (CORRECT_NEW) {
+ if (patternIsRegExp && !flagsAreUndefined) pattern = pattern.source;
+ } else if (pattern instanceof RegExpWrapper) {
+ if (flagsAreUndefined) flags = getFlags.call(pattern);
+ pattern = pattern.source;
+ }
+
+ if (UNSUPPORTED_Y) {
+ sticky = !!flags && flags.indexOf('y') > -1;
+ if (sticky) flags = flags.replace(/y/g, '');
+ }
+
+ var result = inheritIfRequired(
+ CORRECT_NEW ? new NativeRegExp(pattern, flags) : NativeRegExp(pattern, flags),
+ thisIsRegExp ? this : RegExpPrototype,
+ RegExpWrapper
+ );
+
+ if (UNSUPPORTED_Y && sticky) setInternalState(result, { sticky: sticky });
+
+ return result;
+ };
+ var proxy = function (key) {
+ key in RegExpWrapper || defineProperty(RegExpWrapper, key, {
+ configurable: true,
+ get: function () { return NativeRegExp[key]; },
+ set: function (it) { NativeRegExp[key] = it; }
+ });
+ };
+ var keys = getOwnPropertyNames(NativeRegExp);
+ var index = 0;
+ while (keys.length > index) proxy(keys[index++]);
+ RegExpPrototype.constructor = RegExpWrapper;
+ RegExpWrapper.prototype = RegExpPrototype;
+ redefine(global, 'RegExp', RegExpWrapper);
+}
+
+// https://tc39.github.io/ecma262/#sec-get-regexp-@@species
+setSpecies('RegExp');