+var isPrototypeOf = require('../../internals/object-is-prototype-of');
var flags = require('../regexp/flags');
var RegExpPrototype = RegExp.prototype;
module.exports = function (it) {
- return (it === RegExpPrototype || it instanceof RegExp) && !('flags' in it) ? flags(it) : it.flags;
+ return (it === RegExpPrototype || isPrototypeOf(RegExpPrototype, it)) ? flags(it) : it.flags;
};