Android, String.split (String regex) doesn't split all the string

Question

I have a problem with String.split(String regex). I want to split my string in parts of 4 characters each.

String stringa = "1111110000000000"
String [] result = stringa.split("(?<=\\G....)")

When I print result I expect 1111,1100,0000,0000 but result is 1111,110000000000. How can I resolve? Thanks.

This trick with \G in Java does not work in Android. See Split string to equal length substrings in Java for alternatives. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 17, 2017 at 22:08

Alexander Farber · Accepted Answer · 2017-03-29 08:09:37Z

2

Here a solution without regex -

You begin at the string's end, extract 4 or less characters and prepend them to a List:

public static void main (String[] args) {
    String stringa = "11111110000000000";
    List<String> result = new ArrayList<>();

    for (int endIndex = stringa.length(); endIndex  >= 0; endIndex  -= 4) {
        int beginIndex = Math.max(0, endIndex - 4);
        String str = stringa.substring(beginIndex, endIndex);
        result.add(0, str);
    }

    System.out.println(result);
}

Which results in the output:

[1, 1111, 1100, 0000, 0000]

edited Mar 29, 2017 at 8:09

answered Mar 29, 2017 at 7:59

Alexander Farber

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