Trillian :
I have a string which i have to split into substrings of equal length if possible. I have found this solution which will only work if the string length is a multiple of 4.
String myString = "abcdefghijklm";
String[] split = myString.split("(?<=\\G....)");
This will produce:
[abcd, efgh, ijkl, m]
What i need is to split "from the end of the string". My desired output should look like :
[a, bcde, fghi, jklm]
How do i achieve this?
Bart Kiers :
This ought to do it:
String[] split = myString.split("(?=(....)+$)");
// or
String[] split = myString.split("(?=(.{4})+$)");
What it does is this: split on the empty string only if that empty string has a multiple of 4 chars ahead of it until the end-of-input is reached.
Of course, this has a bad runtime (O(n^2)). You can get a linear running time algorithm by simply splitting it yourself.
As mentioned by @anubhava:
(?!^)(?=(?:.{4})+$)to avoid empty results if string length is in multiples of 4