regexp-exec.js
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	'use strict';
	/* eslint-disable regexp/no-empty-capturing-group, regexp/no-empty-group, regexp/no-lazy-ends -- testing */
	/* eslint-disable regexp/no-useless-quantifier -- testing */
	var call = require('../internals/function-call');
	var uncurryThis = require('../internals/function-uncurry-this');
	var toString = require('../internals/to-string');
	var regexpFlags = require('../internals/regexp-flags');
	var stickyHelpers = require('../internals/regexp-sticky-helpers');
	var shared = require('../internals/shared');
	var create = require('../internals/object-create');
	var getInternalState = require('../internals/internal-state').get;
	var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
	var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');

	var nativeReplace = shared('native-string-replace', String.prototype.replace);
	var nativeExec = RegExp.prototype.exec;
	var patchedExec = nativeExec;
	var charAt = uncurryThis(''.charAt);
	var indexOf = uncurryThis(''.indexOf);
	var replace = uncurryThis(''.replace);
	var stringSlice = uncurryThis(''.slice);

	var UPDATES_LAST_INDEX_WRONG = (function () {
	var re1 = /a/;
	var re2 = /b*/g;
	call(nativeExec, re1, 'a');
	call(nativeExec, re2, 'a');
	return re1.lastIndex !== 0 \|\| re2.lastIndex !== 0;
	})();

	var UNSUPPORTED_Y = stickyHelpers.BROKEN_CARET;

	// nonparticipating capturing group, copied from es5-shim's String#split patch.
	var NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;

	var PATCH = UPDATES_LAST_INDEX_WRONG \|\| NPCG_INCLUDED \|\| UNSUPPORTED_Y \|\| UNSUPPORTED_DOT_ALL \|\| UNSUPPORTED_NCG;

	if (PATCH) {
	patchedExec = function exec(string) {
	var re = this;
	var state = getInternalState(re);
	var str = toString(string);
	var raw = state.raw;
	var result, reCopy, lastIndex, match, i, object, group;

	if (raw) {
	raw.lastIndex = re.lastIndex;
	result = call(patchedExec, raw, str);
	re.lastIndex = raw.lastIndex;
	return result;
	}

	var groups = state.groups;
	var sticky = UNSUPPORTED_Y && re.sticky;
	var flags = call(regexpFlags, re);
	var source = re.source;
	var charsAdded = 0;
	var strCopy = str;

	if (sticky) {
	flags = replace(flags, 'y', '');
	if (indexOf(flags, 'g') === -1) {
	flags += 'g';
	}

	strCopy = stringSlice(str, re.lastIndex);
	// Support anchored sticky behavior.
	if (re.lastIndex > 0 && (!re.multiline \|\| re.multiline && charAt(str, re.lastIndex - 1) !== '\n')) {
	source = '(?: ' + source + ')';
	strCopy = ' ' + strCopy;
	charsAdded++;
	}
	// ^(? + rx + ) is needed, in combination with some str slicing, to
	// simulate the 'y' flag.
	reCopy = new RegExp('^(?:' + source + ')', flags);
	}

	if (NPCG_INCLUDED) {
	reCopy = new RegExp('^' + source + '$(?!\\s)', flags);
	}
	if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;

	match = call(nativeExec, sticky ? reCopy : re, strCopy);

	if (sticky) {
	if (match) {
	match.input = stringSlice(match.input, charsAdded);
	match[0] = stringSlice(match[0], charsAdded);
	match.index = re.lastIndex;
	re.lastIndex += match[0].length;
	} else re.lastIndex = 0;
	} else if (UPDATES_LAST_INDEX_WRONG && match) {
	re.lastIndex = re.global ? match.index + match[0].length : lastIndex;
	}
	if (NPCG_INCLUDED && match && match.length > 1) {
	// Fix browsers whose `exec` methods don't consistently return `undefined`
	// for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/
	call(nativeReplace, match[0], reCopy, function () {
	for (i = 1; i < arguments.length - 2; i++) {
	if (arguments[i] === undefined) match[i] = undefined;
	}
	});
	}

	if (match && groups) {
	match.groups = object = create(null);
	for (i = 0; i < groups.length; i++) {
	group = groups[i];
	object[group[0]] = match[group[1]];
	}
	}

	return match;
	};
	}

	module.exports = patchedExec;

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