text: 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 enforceInternalState = require('../internals/internal-state').enforce;
  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.es/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) {
        var state = enforceInternalState(result);
        state.sticky = true;
      }
  
      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.es/ecma262/#sec-get-regexp-@@species
  setSpecies('RegExp');
  