Splitting string into n-length elements for an array


This question already has an answer here:


You can try this way

String input = "123451234512345";
String[] pairs = input.split("(?<=\\G\\d{5})");


[12345, 12345, 12345]

This regex uses positive look behind mechanism (?<=...) and \\G which represents "previous match - place where previously matched string ends, or if it doesn't exist yet (when we just started matching) ^ which is start of the string".

So regex will match any place that has five digits before it and before this five digits previously matched place we split on.

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