JavaScript RegEx to replace repeat characters of more than 2

Question

I have an string, like YYYY/MMM/DD and I want to convert it into YY/MM/DD formart. In short, I want to replace repeated characters more than 2.

Example 01:- YYYY/MMM/DD -> YY/MM/DD Example 02 :- MMM/YYYY/DD -> MM/YY/DD

Please help me out.

Answer 1

可以做到这一点，使用反向引用查找3个以上相同字符的序列，然后仅用两个替换它们：

str.replace(/(.)\1{2,}/g, '$1$1')

Answer 2

try to use this

    var date = new Date();
    var datestr = ('0' + date.getDate()).substr(-2, 2) + '/' + ('0' + date.getMonth()).substr(-2, 2) + '/' + ('0' + date.getFullYear()).substr(-2, 2);
    alert(datestr);