es.regexp.constructor.js
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es.regexp.constructor.js
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	var DESCRIPTORS = require('../internals/descriptors');
	var global = require('../internals/global');
	var uncurryThis = require('../internals/function-uncurry-this');
	var isForced = require('../internals/is-forced');
	var inheritIfRequired = require('../internals/inherit-if-required');
	var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
	var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
	var isPrototypeOf = require('../internals/object-is-prototype-of');
	var isRegExp = require('../internals/is-regexp');
	var toString = require('../internals/to-string');
	var getRegExpFlags = require('../internals/regexp-get-flags');
	var stickyHelpers = require('../internals/regexp-sticky-helpers');
	var proxyAccessor = require('../internals/proxy-accessor');
	var defineBuiltIn = require('../internals/define-built-in');
	var fails = require('../internals/fails');
	var hasOwn = require('../internals/has-own-property');
	var enforceInternalState = require('../internals/internal-state').enforce;
	var setSpecies = require('../internals/set-species');
	var wellKnownSymbol = require('../internals/well-known-symbol');
	var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
	var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');

	var MATCH = wellKnownSymbol('match');
	var NativeRegExp = global.RegExp;
	var RegExpPrototype = NativeRegExp.prototype;
	var SyntaxError = global.SyntaxError;
	var exec = uncurryThis(RegExpPrototype.exec);
	var charAt = uncurryThis(''.charAt);
	var replace = uncurryThis(''.replace);
	var stringIndexOf = uncurryThis(''.indexOf);
	var stringSlice = uncurryThis(''.slice);
	// TODO: Use only proper RegExpIdentifierName
	var IS_NCG = /^\?<[^\s\d!#%&+<=>@^][^\s!#%&+<=>@^]*>/;
	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 MISSED_STICKY = stickyHelpers.MISSED_STICKY;
	var UNSUPPORTED_Y = stickyHelpers.UNSUPPORTED_Y;

	var BASE_FORCED = DESCRIPTORS &&
	(!CORRECT_NEW \|\| MISSED_STICKY \|\| UNSUPPORTED_DOT_ALL \|\| UNSUPPORTED_NCG \|\| 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';
	}));

	var handleDotAll = function (string) {
	var length = string.length;
	var index = 0;
	var result = '';
	var brackets = false;
	var chr;
	for (; index <= length; index++) {
	chr = charAt(string, index);
	if (chr === '\\') {
	result += chr + charAt(string, ++index);
	continue;
	}
	if (!brackets && chr === '.') {
	result += '[\\s\\S]';
	} else {
	if (chr === '[') {
	brackets = true;
	} else if (chr === ']') {
	brackets = false;
	} result += chr;
	}
	} return result;
	};

	var handleNCG = function (string) {
	var length = string.length;
	var index = 0;
	var result = '';
	var named = [];
	var names = {};
	var brackets = false;
	var ncg = false;
	var groupid = 0;
	var groupname = '';
	var chr;
	for (; index <= length; index++) {
	chr = charAt(string, index);
	if (chr === '\\') {
	chr = chr + charAt(string, ++index);
	} else if (chr === ']') {
	brackets = false;
	} else if (!brackets) switch (true) {
	case chr === '[':
	brackets = true;
	break;
	case chr === '(':
	if (exec(IS_NCG, stringSlice(string, index + 1))) {
	index += 2;
	ncg = true;
	}
	result += chr;
	groupid++;
	continue;
	case chr === '>' && ncg:
	if (groupname === '' \|\| hasOwn(names, groupname)) {
	throw new SyntaxError('Invalid capture group name');
	}
	names[groupname] = true;
	named[named.length] = [groupname, groupid];
	ncg = false;
	groupname = '';
	continue;
	}
	if (ncg) groupname += chr;
	else result += chr;
	} return [result, named];
	};

	// `RegExp` constructor
	// https://tc39.es/ecma262/#sec-regexp-constructor
	if (isForced('RegExp', BASE_FORCED)) {
	var RegExpWrapper = function RegExp(pattern, flags) {
	var thisIsRegExp = isPrototypeOf(RegExpPrototype, this);
	var patternIsRegExp = isRegExp(pattern);
	var flagsAreUndefined = flags === undefined;
	var groups = [];
	var rawPattern = pattern;
	var rawFlags, dotAll, sticky, handled, result, state;

	if (!thisIsRegExp && patternIsRegExp && flagsAreUndefined && pattern.constructor === RegExpWrapper) {
	return pattern;
	}

	if (patternIsRegExp \|\| isPrototypeOf(RegExpPrototype, pattern)) {
	pattern = pattern.source;
	if (flagsAreUndefined) flags = getRegExpFlags(rawPattern);
	}

	pattern = pattern === undefined ? '' : toString(pattern);
	flags = flags === undefined ? '' : toString(flags);
	rawPattern = pattern;

	if (UNSUPPORTED_DOT_ALL && 'dotAll' in re1) {
	dotAll = !!flags && stringIndexOf(flags, 's') > -1;
	if (dotAll) flags = replace(flags, /s/g, '');
	}

	rawFlags = flags;

	if (MISSED_STICKY && 'sticky' in re1) {
	sticky = !!flags && stringIndexOf(flags, 'y') > -1;
	if (sticky && UNSUPPORTED_Y) flags = replace(flags, /y/g, '');
	}

	if (UNSUPPORTED_NCG) {
	handled = handleNCG(pattern);
	pattern = handled[0];
	groups = handled[1];
	}

	result = inheritIfRequired(NativeRegExp(pattern, flags), thisIsRegExp ? this : RegExpPrototype, RegExpWrapper);

	if (dotAll \|\| sticky \|\| groups.length) {
	state = enforceInternalState(result);
	if (dotAll) {
	state.dotAll = true;
	state.raw = RegExpWrapper(handleDotAll(pattern), rawFlags);
	}
	if (sticky) state.sticky = true;
	if (groups.length) state.groups = groups;
	}

	if (pattern !== rawPattern) try {
	// fails in old engines, but we have no alternatives for unsupported regex syntax
	createNonEnumerableProperty(result, 'source', rawPattern === '' ? '(?:)' : rawPattern);
	} catch (error) { /* empty */ }

	return result;
	};

	for (var keys = getOwnPropertyNames(NativeRegExp), index = 0; keys.length > index;) {
	proxyAccessor(RegExpWrapper, NativeRegExp, keys[index++]);
	}

	RegExpPrototype.constructor = RegExpWrapper;
	RegExpWrapper.prototype = RegExpPrototype;
	defineBuiltIn(global, 'RegExp', RegExpWrapper, { constructor: true });
	}

	// https://tc39.es/ecma262/#sec-get-regexp-@@species
	setSpecies('RegExp');

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