用方形胸罩劈开一根弦

Question

Similar asked thread but I'm not looking for the same thing as those already posted.

Say I have a String "HELLOWORLDAH".

And I want it formated that way :

[HEL] [LOW] [ORL] [DAH].

The split() method seems to only work on splitting string which already have delimter. I'm looking to add delimiters and separate the strings by three.

Anyway to do this? I understand Regex somewhat.

Answer 1

The splitting already works. Now use String.join() :

System.out.println("["+
    String.join("] [", "HELLOWORLDAH".split("(?<=\\G.{3})"))
+"]");

and you get "[HEL] [LOW] [ORL] [DAH]" .