es.regexp.to-string.js
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es.regexp.to-string.js
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	'use strict';
	var PROPER_FUNCTION_NAME = require('../internals/function-name').PROPER;
	var defineBuiltIn = require('../internals/define-built-in');
	var anObject = require('../internals/an-object');
	var $toString = require('../internals/to-string');
	var fails = require('../internals/fails');
	var getRegExpFlags = require('../internals/regexp-get-flags');

	var TO_STRING = 'toString';
	var RegExpPrototype = RegExp.prototype;
	var n$ToString = RegExpPrototype[TO_STRING];

	var NOT_GENERIC = fails(function () { return n$ToString.call({ source: 'a', flags: 'b' }) != '/a/b'; });
	// FF44- RegExp#toString has a wrong name
	var INCORRECT_NAME = PROPER_FUNCTION_NAME && n$ToString.name != TO_STRING;

	// `RegExp.prototype.toString` method
	// https://tc39.es/ecma262/#sec-regexp.prototype.tostring
	if (NOT_GENERIC \|\| INCORRECT_NAME) {
	defineBuiltIn(RegExp.prototype, TO_STRING, function toString() {
	var R = anObject(this);
	var pattern = $toString(R.source);
	var flags = $toString(getRegExpFlags(R));
	return '/' + pattern + '/' + flags;
	}, { unsafe: true });
	}