Nice job with Regex

Clever. Not readable. Would not call this "best practice."

So cool

Fcking impressing use of regex...

Nice solution!

This answer is very concise,But if you don't fammiliar with "look-around" ,you can't understand.

Clever but slow, unreadable and ugly as hell at the same time. Sorry guys, I've checked several solutions and not even one checks if the received string is null. This code is an example of how not to code.

of course works

it's so beautiful ！！！

i try this method but i can't do it please who can give me somme caption about this --> ".(?=.{4})" ??

Figured it was possible with regex but I didn't feel like giving it a go. The other methods are also faster.

I tested it, it worked for sure:

    public static void main(String[] args) {
        String str = "hellllllloooo";
        System.out.println(clever(str));
        String str1 = "hi";
        System.out.println(clever(str1));
        String str2 = "";
        System.out.println(clever(str2));

    }
 
 #########oooo
hi


    

The power of regex!

did anybody test this? soooo short cant believe it works