1 | var DESCRIPTORS = require('../internals/descriptors');
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2 | var global = require('../internals/global');
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3 | var isForced = require('../internals/is-forced');
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4 | var inheritIfRequired = require('../internals/inherit-if-required');
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5 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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6 | var defineProperty = require('../internals/object-define-property').f;
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7 | var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
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8 | var isRegExp = require('../internals/is-regexp');
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9 | var toString = require('../internals/to-string');
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10 | var getFlags = require('../internals/regexp-flags');
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11 | var stickyHelpers = require('../internals/regexp-sticky-helpers');
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12 | var redefine = require('../internals/redefine');
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13 | var fails = require('../internals/fails');
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14 | var has = require('../internals/has');
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15 | var enforceInternalState = require('../internals/internal-state').enforce;
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16 | var setSpecies = require('../internals/set-species');
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17 | var wellKnownSymbol = require('../internals/well-known-symbol');
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18 | var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
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19 | var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');
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20 |
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21 | var MATCH = wellKnownSymbol('match');
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22 | var NativeRegExp = global.RegExp;
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23 | var RegExpPrototype = NativeRegExp.prototype;
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24 | // TODO: Use only propper RegExpIdentifierName
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25 | var IS_NCG = /^\?<[^\s\d!#%&*+<=>@^][^\s!#%&*+<=>@^]*>/;
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26 | var re1 = /a/g;
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27 | var re2 = /a/g;
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28 |
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29 | // "new" should create a new object, old webkit bug
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30 | var CORRECT_NEW = new NativeRegExp(re1) !== re1;
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31 |
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32 | var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;
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33 |
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34 | var BASE_FORCED = DESCRIPTORS &&
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35 | (!CORRECT_NEW || UNSUPPORTED_Y || UNSUPPORTED_DOT_ALL || UNSUPPORTED_NCG || fails(function () {
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36 | re2[MATCH] = false;
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37 | // RegExp constructor can alter flags and IsRegExp works correct with @@match
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38 | return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
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39 | }));
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40 |
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41 | var handleDotAll = function (string) {
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42 | var length = string.length;
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43 | var index = 0;
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44 | var result = '';
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45 | var brackets = false;
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46 | var chr;
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47 | for (; index <= length; index++) {
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48 | chr = string.charAt(index);
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49 | if (chr === '\\') {
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50 | result += chr + string.charAt(++index);
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51 | continue;
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52 | }
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53 | if (!brackets && chr === '.') {
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54 | result += '[\\s\\S]';
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55 | } else {
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56 | if (chr === '[') {
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57 | brackets = true;
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58 | } else if (chr === ']') {
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59 | brackets = false;
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60 | } result += chr;
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61 | }
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62 | } return result;
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63 | };
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64 |
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65 | var handleNCG = function (string) {
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66 | var length = string.length;
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67 | var index = 0;
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68 | var result = '';
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69 | var named = [];
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70 | var names = {};
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71 | var brackets = false;
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72 | var ncg = false;
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73 | var groupid = 0;
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74 | var groupname = '';
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75 | var chr;
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76 | for (; index <= length; index++) {
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77 | chr = string.charAt(index);
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78 | if (chr === '\\') {
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79 | chr = chr + string.charAt(++index);
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80 | } else if (chr === ']') {
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81 | brackets = false;
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82 | } else if (!brackets) switch (true) {
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83 | case chr === '[':
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84 | brackets = true;
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85 | break;
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86 | case chr === '(':
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87 | if (IS_NCG.test(string.slice(index + 1))) {
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88 | index += 2;
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89 | ncg = true;
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90 | }
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91 | result += chr;
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92 | groupid++;
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93 | continue;
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94 | case chr === '>' && ncg:
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95 | if (groupname === '' || has(names, groupname)) {
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96 | throw new SyntaxError('Invalid capture group name');
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97 | }
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98 | names[groupname] = true;
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99 | named.push([groupname, groupid]);
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100 | ncg = false;
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101 | groupname = '';
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102 | continue;
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103 | }
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104 | if (ncg) groupname += chr;
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105 | else result += chr;
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106 | } return [result, named];
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107 | };
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108 |
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109 | // `RegExp` constructor
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110 | // https://tc39.es/ecma262/#sec-regexp-constructor
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111 | if (isForced('RegExp', BASE_FORCED)) {
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112 | var RegExpWrapper = function RegExp(pattern, flags) {
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113 | var thisIsRegExp = this instanceof RegExpWrapper;
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114 | var patternIsRegExp = isRegExp(pattern);
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115 | var flagsAreUndefined = flags === undefined;
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116 | var groups = [];
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117 | var rawPattern = pattern;
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118 | var rawFlags, dotAll, sticky, handled, result, state;
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119 |
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120 | if (!thisIsRegExp && patternIsRegExp && flagsAreUndefined && pattern.constructor === RegExpWrapper) {
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121 | return pattern;
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122 | }
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123 |
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124 | if (patternIsRegExp || pattern instanceof RegExpWrapper) {
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125 | pattern = pattern.source;
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126 | if (flagsAreUndefined) flags = 'flags' in rawPattern ? rawPattern.flags : getFlags.call(rawPattern);
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127 | }
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128 |
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129 | pattern = pattern === undefined ? '' : toString(pattern);
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130 | flags = flags === undefined ? '' : toString(flags);
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131 | rawPattern = pattern;
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132 |
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133 | if (UNSUPPORTED_DOT_ALL && 'dotAll' in re1) {
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134 | dotAll = !!flags && flags.indexOf('s') > -1;
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135 | if (dotAll) flags = flags.replace(/s/g, '');
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136 | }
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137 |
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138 | rawFlags = flags;
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139 |
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140 | if (UNSUPPORTED_Y && 'sticky' in re1) {
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141 | sticky = !!flags && flags.indexOf('y') > -1;
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142 | if (sticky) flags = flags.replace(/y/g, '');
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143 | }
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144 |
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145 | if (UNSUPPORTED_NCG) {
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146 | handled = handleNCG(pattern);
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147 | pattern = handled[0];
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148 | groups = handled[1];
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149 | }
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150 |
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151 | result = inheritIfRequired(NativeRegExp(pattern, flags), thisIsRegExp ? this : RegExpPrototype, RegExpWrapper);
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152 |
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153 | if (dotAll || sticky || groups.length) {
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154 | state = enforceInternalState(result);
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155 | if (dotAll) {
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156 | state.dotAll = true;
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157 | state.raw = RegExpWrapper(handleDotAll(pattern), rawFlags);
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158 | }
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159 | if (sticky) state.sticky = true;
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160 | if (groups.length) state.groups = groups;
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161 | }
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162 |
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163 | if (pattern !== rawPattern) try {
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164 | // fails in old engines, but we have no alternatives for unsupported regex syntax
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165 | createNonEnumerableProperty(result, 'source', rawPattern === '' ? '(?:)' : rawPattern);
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166 | } catch (error) { /* empty */ }
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167 |
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168 | return result;
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169 | };
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170 |
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171 | var proxy = function (key) {
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172 | key in RegExpWrapper || defineProperty(RegExpWrapper, key, {
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173 | configurable: true,
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174 | get: function () { return NativeRegExp[key]; },
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175 | set: function (it) { NativeRegExp[key] = it; }
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176 | });
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177 | };
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178 |
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179 | for (var keys = getOwnPropertyNames(NativeRegExp), index = 0; keys.length > index;) {
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180 | proxy(keys[index++]);
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181 | }
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182 |
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183 | RegExpPrototype.constructor = RegExpWrapper;
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184 | RegExpWrapper.prototype = RegExpPrototype;
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185 | redefine(global, 'RegExp', RegExpWrapper);
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186 | }
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187 |
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188 | // https://tc39.es/ecma262/#sec-get-regexp-@@species
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189 | setSpecies('RegExp');
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