Regular extension methods in es6 syntax

{
    //es5中let regex = new RegExp('xyz','i');
    let regex2 = new RegExp(/xyz/i);
    console.log(regex.test('xyz123'),regex2.test('xyz123'));
    // true,true
//es6中，flags是新增的，获取正则对象修饰符let regex3 = new RegExp(/xyz/ig,'i');
    console.log(regex3.flags);
    // i 后一个覆盖前面的
}

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